In case of non-delivery, return to (the) sender.

(邮件用语)无法投递时, 退回原处。

Be quiet in case you wake the baby.

轻点儿, 别吵醒婴儿。

Fire-brigades are standing by in case of an explosion.

消防队严阵以待,若有爆炸立刻出动。

In case of fire, walk quickly to the nearest door.

如果失, 就赶快朝最近的门跑。

Never walk behind a horse in case it lashes out.

绝跟在马后面, 以防它突然猛踢。

Take your skates in case you decide to go skating.

把溜冰鞋带去, 说定你们溜冰呢。

The hospital has an auxiliary power system in case of blackout.

这家医院装有备用发电系统以防灯管制。

Keep some candles as a standby in case the power fails.

预备些蜡烛以防断电。

In case of fire, leave the building by the nearest exit.

如遇警，由最近的出口离开大楼。

In case of diabetes, physicians advise against the use of sugar.

于尿病患者, 医生告诫他们吃。

There is a supplementary water supply in case the rain supply fails.

主水源断了, 我们另外有供水的地方。

The hospital has a backup generator in case there is a power failure.

医院有备用发电机以防停电。

There are candles strategically placed—just in case we have another power cut.

我们把蜡烛放在合适的地方，以防再停电。

I like to keep a few envelopes about in case I need them.

我喜欢手边常有几个信封, 以应时之需。

Pick over the lentils carefully in case there are any stones among them.

把这些豆子里的沙粒挑出去。

He sweats blood every time the telephone rings, in case it’s the police.

每次电话铃响他就心惊肉跳，唯恐是警察打来的。

We’ve installed an extinguisher next to the cooker in case there is ever a fire.

我们在炉旁安了个灭器,以防着。

Take an umbrella just in case.

帶把雨傘以防萬吧。

It's safest to remain a good distance behind, in case the car in front suddenly stops.

最安全的方法就是和前面的车保持适当的距离, 以免它突然刹车。

It's safest to keep a good distance behind in case the car in front suddenly stops.

最安全的办法是在后面保持相当段距离, 以防前面的汽车突然停车。