It's so hard to say goodbye to yesterday
记忆是一种保留你所爱之物、你所是之物、你永远不想失去之物的方式。
并不存在一个自由美国和一个保守美国的区别 - 只有团结的美利坚合众国。
Science has no borders, but scientists have a motherland, we must contribute to the development of national agriculture.
The world is a mystery, and we are all detectives.