duff/dʌf/名词臀部，屁股Get off your duff and start working.起来开始干活儿了。/dʌf/动词偷走（家畜）后改变其主人的烙印；偷窃（物品）后改变其外观/dʌf/形容词糟糕的；无用的，不中用的；出故障的He's directed so many movies that you might expect a few duff ones.他执导了这么多部电影，难免会有几部不成功的作品。想跟读，去练习
