A good abstraction is one that emphasizes the important details and suppresses the unimportant ones.
一个好的抽象是强调重要细节并抑制不重要细节的抽象。
You may not realize it when it happens, but a kick in the teeth may be the best thing in the world for you.
点燃蜡烛的同时也投下了阴影。
So given a Time Turner, I would tell my 21-year-old self that personal happiness lies in knowing that life is not a check-list of acquisition or achievement. Your qualifications, your CV, are not your life, though you will meet many people of my age and older who confuse the two. Life is difficult, and complicated, and beyond anyone’s total control, and the humility to know that will enable you to survive its vicissitudes.
I'm just trying to be a good person and live a good life and make good decisions and be a good mom and a good wife and a good friend.