cofferdam coffering作围堰
temporary coffering临时应急围堰
N-COUNT（可数名词） A coffer is a large, strong chest used for storing valuable objects such as money or gold and silver. 保险柜 [老式]
N-PLURAL（复数型名词） The coffers of an organization consist of the money that it has to spend, imagined as being collected together in one place. (某机构的)金库
The proceeds from the lottery go towards sports and recreation, as well as swelling the coffers of the government.
彩票收入用于体育和娱乐事业，以及充实国库。