Immigration can have positive effects on innovation and productivity.
在一个真正属于孩子的地方，孩子会尽力去注意自己的举止，控制自己的行为。
当别人都不相信你时，你必须相信自己。
The heart is a labyrinth of forgotten desires.
The laws of physics are universal, but our understanding of them is constantly evolving.
数学是给不同事物以相同名称的艺术。