She scanned the crowd on the off chance of seeing someone she knew.
她扫视着人群，抱着一线希望看是否有熟人。
I didn't think you'd be at home but I just called by on the off chance.
我想你不会在家，只是碰碰运气顺路来看一下。
He had taken a flight to Paris on the off-chance that he might be able to meet Francesca.
他搭飞机去了巴黎，怀着遇到弗朗西丝卡的渺茫希望。
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