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。
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