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- 如果你万一见到他，请代我向他致意。
If you should happen to see him, please give him my regards.
- 可能下雨--你最好带把伞，以防万一（下起来）。
It may rain you'd better take an umbrella (just) in case (it does).
- 万一下雨，他们就不能去了。
In case of rain, they can't go.
- 万一我忘记，请提醒我。
In case (=If) I forget, please remind me.
- 我们有一台万一断电时使用的备用发电机。
We have an auxiliary generator in case of power cuts.
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