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.
我非常相信用清单来解决难题。你需要在你面前得到所有可能和不可能的答案；否则很容易错过一些重要的东西。
最重要的是你要有一个北极星，你必须知道自己要去哪里。
森林不仅仅是木材，它是生命、文化和遗产。
财富不在于拥有很多钱，而在于拥有很多选择。
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
A good illustration doesn't just accompany text - it converses with it.
"I'm a Martian, ain't no stars in my eyes."