所有人类行为都有以下七个原因中的一个或多个：机会、自然、强迫、习惯、理性、激情和欲望。

Technology will lead us to new frontiers in energy exploration.

One way of looking at speech is to say that it is a constant stratagem to cover nakedness.

最重要的是享受你所做的事情。

试图在不激发学生学习欲望的情况下进行教学的老师，就像在冷铁上敲打。