买本家乡或区域的最新版旅游指南。像游客一样去了解（熟悉的环境）信息，你会学到很多东西。
Do not feel absolutely certain of anything.
Science is a journey, not a destination.
The greatest freedom is the freedom to choose your own thoughts.
大国总是在寻找机会以牺牲对手为代价来获得权力，如果他们认为使用武力会带来战略优势，他们就会使用武力。
You think it will never happen to you, that it cannot happen to you, that you are the only person in the world to whom none of these things will ever happen, and then, one by one, they all begin to happen to you, in the same way they happen to everyone else.