A proof is a device for convincing someone else that a mathematical statement is true.
证明是一种用于使他人相信数学陈述为真的工具。
We either do the best or we don't do it at all.
The balance between production and conservation is delicate, but achievable.
The words we use to describe the world are the world.
科学中的创新往往来自于以新的方式看待老问题。