教育系统的墙必须倒塌。教育不应是特权，所以有钱人的孩子才能学习。
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 essence of literature is to capture the fleeting moments of human experience and immortalize them in words."
