关系模型基于谓词逻辑和集合论。

选择最好的生活，因为习惯会使它愉快。

The power of film lies in its ability to make us feel less alone in the world.

Never forget why you started, and you can accomplish your mission. We must always keep in mind the mission of "dedicating oil to the motherland".

阅读是时间旅行，而书籍是载具。