The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
我们必须倾听并与当地社区互动,了解他们的需求和关切。
真正的喜悦精神、崇高感、超越人类的感觉,这是最高卓越的试金石,在数学中同样可以在诗歌中找到。
The most dangerous risk is refusing to take any risks at all.