1. expensive: adj. 昂贵的注意：汉语里会说“价格贵”，但是在英语中，“贵”对应的不是“价格”，是产品。比如：This jacket is really expensive. (jacket对应expensive)而英语中的价格“price”，则对应的是“高低”，即“high/low”。The price is too high.这是中英两种思维的不同。2. costly: adj. 昂贵的Buying furniture may prove too costly.3. an arm and a leg: 俚语，非常昂贵This sports car cost me an arm and a leg!