It is less polluting than power stations fuelled by oil, coal and gas.比起以石油、煤和天然气为燃料的发电站来说，它的污染要小。the exhaust fumes that are polluting our cities污染我们城市的废气The judge levied a ten thousand dollars fine against the factory f...
我觉得自己像个做苦工的——整天都在做清洁工作!I feel like a real drudge — I've done nothing but clean all day!为了挣点钱，他被迫到卖汉堡的小店里做苦工。He's been forced into slave labour at burger bars to earn a bit of cash.她得关到监狱里去做苦工.She would have bee...