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。
The person who is slowest in making a promise is the most faithful in performance of it.
煤炭研究和DNA工作同样重要。
未来属于那些学习更多技能并以创造性方式将它们结合起来的人。
快乐在于旅程之中。