To solve complex problems, we must first understand the systems that create them.

如果我能用语言表达，就没有理由画画了。

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.

The key to innovation is not just in creating new technologies, but in understanding how to apply them to solve real-world problems.