air pump 基本英英近义反义例句Thesaurus n.抽气机;排气泵 气体 Noun: a pump that moves air in or out of something近义词vacuum pump真空泵 用作名词Vacuum packaging is produced by pumping all the air out of the package.真空的包装都是用抽气机把空气抽出的。noun.air compressor 同义词bicycle pump,vacuum pump