人类要学会从自然中学习。

The problem with quantitative easing is that it works in practice but it doesn't work in theory.

我只是努力保持一致性，每天坚持训练。

一个好的数学问题的定义是它产生的数学，而不是问题本身。

语言不仅是交流的工具，也是思想的载体。

The writer must be a perpetual outsider, a critic of all orthodoxies.