These are the times that try men's souls.
这是考验人们灵魂的时刻。
数学的本质在于它的自由。
We must listen to the science and act decisively to preserve marine biodiversity.
If you can’t get a miracle, become one.
The past is always tense, the future perfect.
I’m a great believer in solving hard problems by using a checklist. You need to get all the likely and unlikely answers before you; otherwise it’s easy to miss something important.
译文：先从忧患方面考虑事情的人，就会享受到乐事，一时的操劳辛苦是永远安逸的开始。赏析：我们做事要有忧患意识，要有先苦后甜的意识，如果只图安逸快乐，就是祸患的开始。
在衣着上你可以不修边幅，但切不可让灵魂染上污点。
合成材料的未来在于在分子水平上理解和控制聚合物的结构。