一鼓作气，再而衰，三而竭。
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。
A book should feel like a friend to a child—comforting, exciting, and full of surprises.
我相信努力和坚持。
The best way to predict the future is to invent it.