失去一个父母可能被视为不幸;失去两个则看起来像是粗心大意。
"I don't take anything for granted. I work for everything I achieve."
孩子们从来都不太擅长听长辈的话,但他们从未停止模仿长辈。
Life has no meaning unless we give it meaning.
NP完全性的概念为理解问题的复杂性提供了一个强大的工具。