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重点
1.not… until…
eg. I won’t leave until you do.
你不走我就不走。
eg. I didn’t leave the house until he came back.
直到他回来我才离开家。
2.happen to 碰巧，偶然
eg. You don’t happen to know his name, do you?
你不会碰巧知道他的名字吧？
eg. Tonight just happens to be a good night.
今晚只是运气好而已。
