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;物未到手前,未能算己有;凡事难以十拿九稳。
When lights fuse, furniture gets rickety, pipes get clogged, or vacuum cleaners fail to operate, some woman assume that their husbands will somehow put things right.