Should I buy a face mask just in case?
我需要买口罩以防万一吗？
Consider buying a mask in case you need it in the future.
考虑买一个口罩以防万一你用得着。
In case of any other emergency, an oxygen mask will come down from overhead.
如果遇到其它紧急情况时，会从头顶上方落下一个氧气面罩。
An oxygen mask will come down from overhead in case of emergency.
如果发生紧急情况，头顶上会放下一只氧气面罩。
An oxygen mask will come down from overhead in case of an emergency.
若发生紧急情况，头顶上会放下一只氧气罩来。
An oxygen mask will come down from overhead in case of an emergency.
若发生紧急情况，头顶上会降下一只氧气面罩。
An oxygen mask will come down from overhead in case of an emergency.
若发生紧急情况，头顶上会降下一只氧气面罩。
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