There's many a slip between the cup and the lip! Who knows what may happen.

事情往往功败垂成，谁知道将会发生什么。

youdao

Many a slip(many things fall) between the cup and the lip.

酒杯来到嘴唇边，得饮与否未可知；物未。

youdao

You hope to inherit your aunt's fortune! Well, remember there's many a slip between cup and lip; she may marry again.

你想继承你姑妈的大笔财产！不过要记住凡事很难有十拿九稳的。她有可能再结婚的。

youdao

But there's many a slip 'twixt cup and lip, and no important graphene products are yet on the market.

ECONOMIST: The 2010 Nobel prizes