The Marshal stepped over the vacuum-cleaner and stumped out of the room.元帅迈过真空吸尘器，脚步沉重地走出了房间。He could hear the whirr of a vacuum cleaner.他能听到真空吸尘器的嗡嗡声。Nuclear power is cleaner than coal.核能比煤清洁。...
...oven cleaner.烤箱清洁剂The law would encourage companies to switch from coal to cleaner fuels...该法律将鼓励企业转而使用比煤更加清洁的能源。...industrial research into cleaner fuels.对更清洁燃料的工业研究Clothes cleaner cleans away all greasiness By just ...