work up  使……渐渐……

　　That'll really work up your appetite for lunch. 那样的话会提升你的食欲的。

　　Go work up some new ideas and then we'll go over it during lunch. 去想几个好主意来，然后我们吃午饭时好好商量商量。

　　I just think you're getting worked up over nothing. 我觉得你在为一个莫名其妙的事情发火。

　　What are you so worked up about? 你为什么会那么生气？

　　Have you worked up the courage to ask her out? 你鼓起勇气约她出去了吗？

　　I'm still too afraid.  我还是很害怕。