Hi Kailin,
Your text is very good. I've just made some comments regarding style and clarity.

A job that interests you VS a job that earns you great money

It has been taken as gospel by some [to say "a group of people" suggests you have a specific group in mind and will talk more about it. If you want to keep it vague it is better to simply say "some people"] people, to "do what you love to do", since Steve Jobs delivered his speech at Stanford in 2005. I was one of them, very inspired and fascinated by the picture of freedom depicted in his speech. However, later I found it is quite difficult to do what I love to do, not because the job is difficult but the rather because reality is cruel ["the reality" also sounds too concrete, like when one says to a politician "It sounds good on a speech, but the reality on the ground is different". If what you mean is something more abstract and general it is better not to use "the"].

A frequent conflict occurs between doing the job you love and making enough money. A job that interests you doesn't necessarily bring in a good payment. Well, if you do the job to an extreme like Steve Jobs did, that might happen, because he was creating new knowledge and advanced technology.

Some people may argue that money is not everything. However, without money, there is almost nothing. The exception occurs in terms of those people who are contented in poverty, rich in mind though flat in pockets, like what Confucius advocates [This is a bit prolix. You could say: "Exceptions are in those people who are contented in poverty, living with a rich mind but empty pockets, the way Confucius advocated". The expression "flat in pockets" sounds like an idiom, reminiscent of "flat tire", though I have never heard of it. It is okay to be creative with the language, just be careful not to sound a bit affected]. Unfortunately, in reality, a good number of people can't be completely indifferent to fame and wealth, like me. An interesting question comes up: what is the definition of "enough wealth" ? or how much will you trade off between your own interests and the money you want to earn (on the hypothesis that you need to sacrifice interests for money)?

"There is never a limit", my roommate commented. People tend to be greedy and feel it an 'obligation' to keep up with the Joneses. When getting good money, you want to earn greater even more money. So does that mean you need to sacrifice all of your happiness and interests for the great money you want to earn ?

"No, because there is a job that could combine interests and good enough payment!" one may argue.

Actually, the ultimate conflict arises is not between making money and maintaining interests but between making A GREAT DEAL of money and still having interests [I understood what you mean by the example you gave next. However the first sentence in this paragraph is not clear. When you mention "maintain interests" and "having interests" what you have in mind is the personal satisfaction you get from acting on your personal interests. Bear in mind that one could have interests without acting on them. Instead you could say, for instance, "The ultimate conflict is not between making money and achieving personal satisfaction, but rather between making a great deal of money and achieving this satisfaction"]. For example, I love teaching English to kids which may earn me 3000 RMB per month after graduation. However, I want 6000 per month, which is, in the short term, not likely to be earned  by being a teacher. In this case I need to sacrifice, because what I want exceeds what I can earn by doing what I love to do. The rule is simple: sacrifices are needed when the expectations are high.

A job that interests you versus a job that earns you great money, the choice lies in how greedy you are, if you can't be as innovative as Steve Jobs. In addition, it might be a perfect combination to do one thing for pleasure without payment and do another for getting paid.

What is your choice?

Você é o professor (embora severo). Na minha opinião um professor é sempre confiante, de modo que os estudantes confiem nele. E eu acredito que nesse professor pode-se confiar.

ROTINA MATINAL

Descendo Descer da cama é um procedimento complicado e frustrante para um pobre reformado. Antes de eu me levantar, eu tenho que de (o correto é dizer "ter de" quando se quiser expressar obrigação, necessidade. No entanto dizer "ter que" é um erro muito comum, mais comum até que a forma correta, pelo menos no Brasil. Não sei se por isso já é aceito) fazer uma boa extensão (esse tipo de exercício físico no Brasil se chama "alongamento", talvez em Portugal o termo seja mesmo "extensão", não estou certo), para colocar em funcionamento os meus ossos velhos e alguns músculos o que eu ainda uso. Levanto-me, é claro, na perna direita, para ter um bom dia com feliz felicidade e sucesso. Depois da decsida descida da cama ("descida" não está errado, mas melhor é "Depois de descer da cama"), estou fico à procura das chinelas, que sempre ficam estão em lugares inesperados. ( O meu filho diz que as coisas ao redor da pela ("ao redor" é o mesmo que "no entorno", pelo lado de fora) casa esconde um alemão qualquer chamado Alzheimer (objeto antes do sujeito também é possivel em português, mas pode prejudicar a clareza se não for bem empregado. Melhor seria "Meu filho diz que um alemão qualquer chamado Alzheimer esconde as coisas pela casa"). Não tenho nenhuma idéia sobre o que ele fala ). A higiene matinal, no meu caso, é espetacular. Como não posso me dobrar, a minha dança tomando duche parece uma espécie de complicadas de aulas de ginástica. Entretanto a minha esposa, querida Maria, já preparou uma boa chávena de café e todas as novidades da nossa vizinhança A Senhora Braga, do terceiero terceiro andar, divorcia-se novamente. E assim começa um novo dia.

Tanto "duche" quanto "chávena" estão corretos. São termos usados em Portugal. No Brasil diríamos "ducha" e "xícara".

The Ancient Chinese Practice of the Game Theory

I took my first Game Theory class last Wednesday morning. Game theory is, from my understanding, about how to make a strategic decisions so as to maximize your profit (also: pay-off. This term is often used in GT). A famous story from The Romance of the Three Kingdoms will perfectly explain the game theory.

In around A.D. 200, the there major political groups were respectively led respectively by Liu (the State of Shu), Cao (the State of Wei), and Sun (the State of Wu). Cao's bloc was usually considered the most powerful. In A.D. 208, Liu and Sun decided to join together forces ("to join forces" is a common expression) to fight against Cao in Chibi, on the waterside of the Changjiang River (or "on the banks of"). A sudden shift in the wind direction, predicted by Zhuge Liang, a strategist for Liu, set off a severe and plotted fire on Cao's warships and thus routed him in this important battle (This last sentence is not very clear: wind does not set off fires, rather it spreads them. Also "plot" is to plan secretly, it is not yet to act on the plan. So maybe this is what the story tells: "As Zhuge Liang, a strategist for Liu, predicted, a sudden shift in wind direction spread a fire they had started on Cao's warships, thus routing their opponents in this important battle".

Enduring Having suffered the most shameful failure defeat ever in his life, Cao fled. His men were confronted with two choices. One was the main road, which showed no sign of danger, but which would take longer time to traverse. The other was a winding mountain track called Huarong Dao, where a wisp of beacon-fire and smoke could be seen, suggesting an ambush (a beacon is a deliberate signal. If the fire was set up by ambushers it could only be unintentionally that its smoke was visible from afar). Which road would you take, if you were Cao?

After all, Cao chose the latter one, which seemingly hinted at a trap, because he thought it was Zhuge's scheme plan trying to try to induce him to take the main road by faking its safety (here "plan" is clearer. "Scheme" suggests a more complex plan. You could also have said: "it was part of Zhuge's scheme to try to induce him...). Unfortunately, he was wrong.

Cao was such a sensitive and suspicious man that Zhuge, the most intelligent strategist in the book, could easily see through his mind. Zhuge deliberately made a sign of smoke on the cranky craggy mountain track, knowing that Cao would assume that the ambush was, on the contrary, plotted on the main road.

However, Cao was not captured in Huarong Dao, even though he chose the wrong road, because he was set free by Guan Yu, a loyal and devoted general in Liu's bloc. This was another interesting story in the Romance of Three Kindoms, also associated with the game theory,too.

Considering Zhuge's and Cao's strategies  the strategies available to Zhuge and Cao (if you're talking about a game in GT, what characterizes a game are the available strategies, not simply the one's the players chose or are predicted to choose, as your wording suggests), it was actually an incomplete information dynamic game. Zhuge, who read his rival's mind, was not surprisingly the winner.

So I think that the game theory is also about being a mind reader mind reading. (To say that GT is about being a mind reader hints at the idea that in order to understand or to apply the theory you have to be a mind reader yourself.)

--Question:
"A famous story from The Romance of the Three Kingdoms will perfectly explain the game theory."
Can I replace "story" by "event" and write : "A famous event from The Romance of the Three Kingdoms will... ." (Because the Chibi war was very significant)?

The word "event" does suggest something historical, something that really happened, though this is not a rigid rule. One can talk about the events in a work of fiction. However, if you want to make it clear that the "events" are fictional and not historical it is best to use the word "story". If you want something more neutral you can also say "narrative". 

I tried to retell the story as vividly as it was narrated in the book. But it was hard. Thanks for your correction!

REFORMA

Toda a minha família acha que eu, como todos os reformados (sobre uso: em Portugal diz-se de todos que chegaram à idade certa e pararam de trabalhar que estão "reformados". No Brasil usa-se o termo apenas para militares, todos os outros são "aposentados"), tenho um monte de tempo livre, sem qualquer trabalho ou obrigações. Como Imaginam que eu esteja sentado na minha poltrona, girando os meus polegares por o dia inteiro. O perigo de minha caida no terrivel pecado da preguiça preocupava muito e seriamente a minha família por todo o tempo. Para guardar a minha saúde física e mental, todos os membros da minha querida família encontram sempre alguns trabalhinhos para mim. Hoje, por exemplo, foi um dia muito interessante: tirei os formulários necessários para matricular o meu sobrinho Pedro de Mafra na universidade, reclamei da conta de telemóvel da minha filha ("reclamar de" significa mostrar-se descontente, "reclamar" sem preposição, significa requisitar, pedir para si. Por ex. "Fui à loja da companhia telefónica reclamar da conta" - Possivelmente o valor na conta veio errado e fui lá reclamar desse problema. Mas "Fui ao banco reclamar a conta de telefone" quer dizer que a conta por algum motivo não me foi entregue em casa e estava em posse do banco. Fui lá pedir que me a entregassem), devolvi na biblioteca um livro que o meu neto Ricardo tinha lido há dois meses, comprei na farmácia um gel contra dores reumáticas para a minha esposa e finalmente dei um passeio com o cãozinho da minha irmã Antónia. Ela estava ao cabeleireiro e não tinha tempo por para nada. Espero que não vao cair caiam (subjuntivo) no sono durante o jogo de futebol desta noite na televisão.

Quarta-feira

Hoje eu fui á à (aula de) yoga pela manhã. Eu amo esta classe do yoga. A instructora instrutora dá explicações excelentes. Ela me desafia em cada sessão. Eu não posso esperar para o dia quando posso estar colocado minha cabeça. Mal posso esperar pelo dia quando poderei ficar ereto/apoiar-me sobre minha cabeça. 

Esta noite eu joguei cartões cartas com os idosos. Eles jogam bem. Alguns deles são têm mais de noventa anos. Um homem lutou na primeira guerra mundial!

Depois eu saí para beber umas cervejas com uma amigo. Nós conversamos sobre as coisas profundas da vida. Cerveja ajuda com conversas como essa.