你知道，当你悲伤的时候，就会喜欢看落日了。

The secondary rules are those that provide for the creation, alteration, and extinction of primary rules.

文学是可见世界与不可见世界之间的桥梁。

The modern state is characterized by its ability to concentrate and use power effectively.

每一个想法都是适应之舞的一步。