世界上充满了门，每一扇门都是一个选择。

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

"To be human is to be unfinished, to be always becoming."

For the livestock industry to develop, it must take an environmentally sustainable path.

你无法吵赢一个理性能力不在同一层面的人。