使变量可变很容易。控制恒定的持续时间是诀窍。

These walls are really interesting. At first you hate it, then you get used to it. After a considerable period of time, you will depend on it.

人类起源的故事仍在书写中。

像我们这样的人在这样的情况下，我们必须确保他们看到我们。