When a child asks an endless string of “why？” questions， the smartest reply is， “I don’t know， what do you think？”

解释：第一次击鼓能振作士兵们的勇气，第二次击鼓可以使士兵们的勇气低落，第三次击鼓士兵们的勇气就消失了。

Technology is transforming coal mining from a brute force industry to a precision operation.

Success in life means doing that which is the very best for us, under the conditions in which we are placed.

我不相信运气，我相信准备遇到机会。