我们今天种植的每一棵树都是对明天清洁空气、稳定气候和繁荣生态系统的投资。

It is not unlikely, but that there may be yet invented several other helps for the eye, as much exceeding those already found, as those do the bare eye.

我们学得越多，就越意识到我们不知道的还有很多。

你不必总是知道你要去哪里，只要你继续前进。