文化只是一种带着激情做事的共享方式。

If you want respect, earn it. No one owes you anything.

The defining decade: Why your twenties matter—and how to make the most of them now.《The Defining Decade》

每一种化合物都必须有确定的组成，这可以用其元素的符号来表示。

消化管代表了一条穿过整个生物体的管道。