set one's jaw 坚持到底
【讲解】
jaw的本义是“颌”;动词set有“使脸部出现坚定不移的表情”的意思。set one's jaw用来形容人把下巴一沉,表现出坚毅不服输的表情。
【对话】
A:I haven't seen you for a long time. What are you doing?
A:好久不见了,你在干什么?
B:I've been keeping on studying the piano.
B:我一直在学弹钢琴。
A:How's it going?
A:学得怎么样?
B:Too bad. I failed the test for degree. So I have to set my jaw to do more practice.
B:糟透了,我等级考试没过,所以我只好咬紧牙关进行更多的练习。