good ear
敏锐的听觉
A:Have you met John?
A:你见到约翰了吗?
B:Yeah. He came back from America last week.
B：是的，他上个星期刚从美国回来。
A：Have you noticed how fulently he speaks English! He has only lived in America for less than three months.
A:你有没有注意到他现在能讲一口流利的英语?他在美国才住了不到三个月。
B:He must have a good ear.
B：他听觉一定非常敏锐。