Life is like an electrostatic image.

Life is like an electrostatic image, if the line goes super stable without even a little vibration, you are dead.
You may want to say, that is [way/so/really] *("way" is fine to say, but it is American slang :))* ridiculous. Both of them are totally irrelevant, and the idea of gathering them is more so nonsense.
However in a sense, it is telling us those troubles are like gifts that the gods or some (higher) powers made for us, which we [take pains/try our best/try hard/struggle] to get rid of , but run into them in the roads we are trying to avoid at the same time. Indeed they are not as wholly terrifying as what they look like. Sometimes, they are even necessary. But for them, our life won't be that colorful and sentimental.
A man was fired for his failure [on duty/on his watch] *("on his watch" is like an idiom for "on duty", but just suggests that it was when he was in charge)*! Whether [for/because of] his poor capacity or his carelessness, he had got to find a new one.
A girl who found out she had been cheated on by her bf for their whole relationship on the day two weeks before her wedding. Whether she fights or leaves in silence, she could not go along with the liar any more.
An investor lost his money for buying a stock *("stock" is a plural word, so you don't need "a" before it. But if you're talking about just one thing, you would say "an item" or "an item of stock")* he had chosen on his way to the stockjobber. Whether he reports it or starts looking for the sum of money immediately, he would not catch buying it.
it won't make much difference whatever way they choose to make up or deal with their tribulations and it is not the point yet. The point is, what they are going to do with those matters in their future.
Actually, all of them had lucky endings with the vibrations in their electrostatic image.
The guy who was fired had found another job with a better pay. The most important thing is, he likes it, he enjoys doing his job.
And, the girl, superficially, was cheated on the whole time while with that bastard. As a matter of fact, she found her Mrs Right *("Mrs Right would suggest that she found another woman. If you mean a man, it would be "Mr Right"!) after she broke up with him. In her memoir, she wrote that, in the period with the liar, she did not feel any passionate and just killed time with him out of habit! That was why she put the wedding date as late as she could!
As to the pitiful investor! His money was brought back on the next day morning by a couple of nice officers and his stock was not worth a penny by that time!

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When it happens, just assume that, after all, you have nothing to lose! If you don't fall, you can't rise back up again No falls, say nothing to rise. If there is something that could let you down, there must be some ways to get you back! Afterwards, what you are going to do is to gather experience and learn a (new) lesson. That way, you curve, rise more and fall less, and will (hence) *("hence" means "therefore", but fits quite nicely here!)* demonstrate an ascending trend (for you) in sum! So, it's no better for you if you always put your mind to avoiding vibrations rather than focusing on how to deal with them. Every vibration makes you more powerful, and the total sum of them can put you on the road to success *("on the road to" is a popular saying in the English-speaking world. "On the road to success", "On the road to failure"...)* . That is what the word "life" is standing for, what vibration created for and where your life' s color is coming from.

 The compostion topic was what our teacher left for us. Could you help me to correct it? Thanks a lot, I know it is a troublesome work... hehe

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I could finally correct this for you now :P 
What an interesting and optimistic topic! It's great to think that great things can come out of bad ones, especially when we live in a world which is so focussed on us always getting things correct.

Also, your English is pretty good! A lot of my corrections are native corrections and suggestions, so please don't be put off or discourages by how much I've written :) And ask me questions about the corrections if you want!