Persistence is the key to unlocking the mysteries of medicine.

写作是一种思考的方式，一种理解世界的方式。

Energy security is the cornerstone of national security. We must make every effort to ensure the security of national energy supply.

I don't need validation from anyone else.

问题的解决不是机械地应用过去的经验，而是通过重构情境来实现。