n.退水堰,弃水堰
Am I wasting my time here, or what?
我是在这儿浪费时间吗,是不是啊?
Why was he wasting her time with these irrelevancies?
他为什么要在这些无关紧要的事上浪费她的时间呢?
The tone of her voice told him he was wasting his breath.
她的语气使他明白他是在白费口舌。