This will keep water out of the tank and will be a reserve in case you get into trouble.

这样既可以防止水进入油箱，又可以作为能源储备，以备不时之需。

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The durable high-impact plastic case is water resistant to 100 feet.

这种耐久的高强度塑料盒在100英尺水深以内是防水的。

《柯林斯英汉双解大词典》

But, in this case, no pumps meant no water movement.

但是，在这种情况下，没有水泵意味着没有水移动。

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If that is the case, it may be possible that the moon could hold enough water for future explorations or even colonies.

VOA: special.2009.12.30

Is there an Android alternative that's as useful in our special circumstances, and is it compatible with a sturdy, water-proof case for it?

ENGADGET: Ask Engadget: best tablet, software and case for a child with a developmental disorder?

That excuse would not hold much water in this case.

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It comes with a lanyard that lets you wear it around your neck and an armband that lets you attach it to your bicep, as well as a water-resistant case.

FORBES: Magazine Article