安全不是我们的优先事项，而是我们的基础。

Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.

科学家的工作永远不会结束。

人类最伟大的成就是我们彼此讲述的故事。