The past is not dead, it is not even past.

To be silent is to be complicit.

机器人应该成为人类的伙伴，而不是对手。

The comfort of the rich depends upon an abundant supply of the poor.

In teaching history， there should be extensive discussion of personalities who benefited mankind through independence of character and judgement.

一个常见的经验是，一个晚上难以解决的问题在睡眠委员会工作后，在早上得到了解决。