"实在" can be an adj, means honest, 他是个实在的人(he is an honest man), and "实在" also can be used as an adv, "really",我实在抱歉(I am really sorry). “真” is used widely as an adj, means real,ture, veritable or even original...这是真的,不是赝品（it is original,not an imitation）, 这件事是真的（this is true）. "真" is similar to "实在" in adv,我真抱歉（我实在抱歉）真地 我真的实在很抱歉（I am really really sorry），both are adv 他是真的实在(he is really honest), 真is adv,实在 is adj,

仇恨 is a noun, hatred 恨 can be used as a noun, is similar to 仇恨， and 恨 also can be a verb, hate. For an example, as a verb,我恨他。（I hate him） as a noun, 我对他的恨是不会忘记的。（I will not forget the hatred toward him）

A.D.220 曹操died,his son,曹丕succeed to the throne, A.D.226 the son of 曹丕，曹睿 was crowned.And before he died, he entrusted the prince曹芳 to the care of 司马懿. The power of 魏 fell into 司马family‘s hand gradually. A.D.263 魏 annexed 蜀 to its territory. A.D.265 The grandson of 司马懿，司马炎(Sima Yan) forced the emperor 曹奂（another grandson of 曹操）to abdicated and became the first emperor of 晋. A.D.280 吴 fell to 晋's occupation.晋 unified the whole of China. Do you understand?

大夫 has two pronunciations, 大（da）夫 is an official position in ancient China, and 大（dai）夫 is as same as 医生，but 大夫 is informal.

Agree with Ricky, and what's more, 或者is more written, and 还是 is more spoken

“er bai wu”( the dialect in south of China, people may say "er bei wu" ) is a figure "250“，means:"fool, stupid or mad". In ancient Chian, the 500 liang(a unit of weight equal to 50 grams in China) of silver we called one feng(a unit of money in ancient China),"feng" is similar to ”疯"(mad,fool) in pronunciation, so the 250 ,the half of 500, means “半疯半傻"(half of mad,fool).

The temperature in winter in Beijing is similar to the cities of USA in the same latitude, although it is cold outside, the central heating systerm will keep you warm indoor.

要说个别单词不好说，最好是放到句子和语境里去，“涉及”可以用 involve，refer to, relate to...“代表”就更多了。