a mechanical device that rotates to push against air or water
造句
用作名詞(n.)
Equipped to float with impermeable canvas skirts, these tanks were to propel themselves to the beach with an ad hoc propellor and then resume normal operation. 這些坦克車下截設有不透水帆布圍裙，以便漂浮，并特設螺旋槳，以便向海灘推進，登陸之后即可照正常操作。