A mathematician's work is never done; there are always new questions to explore and new mysteries to uncover.
我喜欢练习击球并尝试找到新的击球方式。
设计中最难的部分是保持功能的简洁。
The uniform, constant, and uninterrupted effort of every man to better his condition, the principle from which public and national as well as private opulence is originally derived.