一个命题的证明是一种性质使得我们相信该命题的过程。
A proof of a proposition is a process the nature of which is such as to produce in us a belief in that proposition.
Mathematics is the language in which the gods talk to people.
Chemistry is the bridge between the microscopic world and the reality we see every day.
【讲解】：人格高尚的人不可用小事情考验他，却可以委以重任；人格低下的人不可委以重任，却可用小事情考验他。
在生物圈的地质历史演化中，智慧圈是众多阶段的最后一个阶段。
一本书必须是我们内心冰冻海洋的斧头。