To lose one parent may be regarded as a misfortune; to lose both looks like carelessness.
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。
数学是理性的音乐。
我不是说唱歌手，我是一个炼狱的传奇。
The concept of probably approximately correct (PAC) learning has been foundational in computational learning theory.
I want people to see that justice can be firm but fair, and that the law can serve people, not just punish them.
一次又一次地后悔到终身,还不如不做后悔之事而无后顾之忧。
激发对一门学科兴趣的最好方法是使其值得了解，这意味着要使知识可用。