| 短语 | once in a lifetime |
| 释义 | once in a ˈlifetimeused to describe sth special that is not likely to happen to you again（可能）一生只有一次An opportunity like this comes once in a lifetime.像这样的机会一生也许只会遇到一次。a once-in-a-lifetime experience一生只会拥有一次的经历 |
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