There is a supplementary water supply in case the rain supply fails.
一主水源断了, 
外有供水的地方。
There is a supplementary water supply in case the rain supply fails.
一主水源断了, 外有供水的地方。
I took the precaution of locking money in the safe.
把所有的钱都锁在保险箱里以防一。
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