Hayley教口语，“破天荒”用英语怎么说？
2019-07-06 10:12:37 每日学英语
one-off
something that happens or is made or done only once
一次性的事物；只发生一次的事
A: Why are you home from school early?
你为什么这么早放学回家了？
B: The teacher let us finish half an hour early today, as a one-off.
破天荒头一次，老师今天让我们提前半小时下课。