The Liskov Substitution Principle is a fundamental concept in object-oriented programming, stating that objects of a superclass should be replaceable with objects of a subclass without affecting the correctness of the program.

Stories are light. Light is precious in a world so dark.

我们相信，通过我们的努力，可以让世界变得更美好。

心灵不过是人类经验的总和，从依赖于经验个体的角度来考虑。

"The best children's books are those that respect the intelligence of the child."

林业创新不是要取代自然，而是要与自然合作。