The poor are often forced to make choices that no one should have to make.

我一直在挑战自己，因为我不想重复。

帮助地球最有效的方法就是停止食用动物。

The existence of the natural world is the same kind of fact as the existence of any proposition.

书籍是连接我们与未来的桥梁。

In chemistry, the smallest change can lead to the biggest revolutions.