在苦难时回忆幸福是最深的痛苦。
There is no greater sorrow than to recall happiness in times of misery.
If you're not stubborn， you'll give up on experiments too soon. And if you're not flexible， you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.
我不会让消极情绪击垮我。
我不相信运气，我相信准备遇上机会。