The beauty of mathematics is that it allows us to abstract away from the physical world and focus on the underlying principles.

It is now clear that the hybrids form seeds which have the one or the other of the two differentiating characters.

The past is never dead. It's not even past.

生存的关键不仅仅是体力，还有心理韧性。

真正的旅程不是寻找新的风景，而是拥有新的眼光。