短语词组短語steam damping -drum drier 蒸氣乾燥primary steam -drum 一次汽鼓steam -separating drum 蒸汽分離包steam drum water -level 汽包水位single -drum steam generator 單鼓式蒸汽發生器four -drum steam hoist 四滾筒蒸汽提陞機high -pressure steam drum 高壓汽包 返回 steam drum