没有牺牲，就没有自由。

The Liskov Substitution Principle is a fundamental concept in object-oriented programming, ensuring that derived classes can be used in place of their base classes without altering the correctness of the program.

研究的坚持是关键；自然只向有耐心的人揭示它的秘密。

Losses loom larger than gains in people's minds.

作为领导者，我们最强大的工具是我们自己的榜样。