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当你打开油漆或颜料时,哪怕只用一丁点,无论你多么小心,它总会沾到你的衣服,不妨准备好新的着装。
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.
A good novel tells us the truth about its hero; but a bad novel tells us the truth about its author.