科技创新没有捷径，必须脚踏实地，久久为功。

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

To live is the rarest thing in the world. Most people exist, that is all.

Optimism is a strategy for making a better future. Because unless you believe that the future can be better, you are unlikely to step up and take responsibility for making it so.