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two-time v. 脚踏两条船；对…不忠
two-timer n. 脚踏两条船的人

She was two-timing on me so we broke up.
她脚踏两只船，所以我们就分手了。

two times 两次
twice 两次

twice a week 每周2次
twice a day 每天2次

I brush my teeth twice a day.
我每天刷牙两次。

overtime 加班 OT
I hate overtime.
我讨厌加班。

overtime 加班费
earn some overtime 赚加班费