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.

无论你注定要做什么，现在就做。条件总是不可能的。

You have to believe in yourself when no one else does. That's what makes you a winner.

"Color is a language; it can convey mood, time, and even character development."