事情因为保密而成功，言语因为泄露而失败。

Stolen bodies working stolen land. It was an engine that did not stop, its hungry boiler fed with blood.

教师必须为形成较好人类而献出一切。

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.

战略不是计划的结果，而是相反：它是计划的起点。