To signal an emergency， use the rule of three； 3 shouts， 3 horn blasts， or 3 whistles.

出自汉·桓宽《盐铁论·地广》。贱，指地位低。贫，指没有钱财。地位卑贱并不妨碍一个人的智慧，家境贫寒并不妨碍一个人的品行。这句话言评价一个人的才智、德行不能根据其社会地位、经济状况来作判断。出身低贱的人，不一定没有智慧；家境贫寒的人，不一定没有品行。

漂亮的女人休要让她老去，风流浪的子不要让他贫困。

I don’t have time to hate people who hate me, because I’m too busy loving people who love me.

One of the great mistakes is to judge policies and programs by their intentions rather than their results.

电影的美在于它能够讲述超越语言和文化的故事。

Technological innovation is the fundamental way to solve the problems of the coal industry.