A proof tells us where to concentrate our doubts.
证明告诉我们该集中怀疑的地方。
The only way to make sense out of change is to plunge into it, move with it, and join the dance.
我从不买任何东西,除非我能给自己一个充分的理由为什么要买它。
Never underestimate the power of collaboration—great things are rarely achieved alone.