Each morning cleaners make sure everything is spotless.每天早晨，清洁工们会把一切都打扫得干干净净。Vacuum cleaners work by suction.真空吸尘器靠抽吸除尘。He travels in vacuum cleaners.他到各地推销吸尘器....
Window cleaners are pulled up and down tall buildings on cradles.窗户清洁工乘坐能升降的吊篮清洗高层建筑物的窗子。Since the 1960 s entrepreneurs have installed them in banks, bookstores, dry cleaners, and liquor stores.20世纪60年代以来,企业家在银行 、 书店 、 干...