The studio isn't soundproof.这个摄影棚并不隔音。This material is soundproof.这材料是隔音的.These boxes were usually old freight cars that were almost soundproof.这些包厢通常采用几乎能隔音的旧火车货柜....
看不见的手的效能必然要相应地降低.The virtues of the invisible hand must be that much discounted.然而, 它不需要被吸收的水汽层来发挥效能.However, it does not require an absorbed vapour layer to become effective.我昨天询问过该新机器的效能.I asked about the efficiency of...