appetite 食欲，胃口，欲望

　　I have no appetite because I didn't sleep well last night.

　　我现在没什么胃口，因为昨晚没睡好。

　　Jack works hard, he has a big appetite for improving himself.

　　Jack工作很努力，他非常想要提升自己。

　　疯狂练习吧！