a mechanical device that rotates to push against air or water
例句
用作名词 (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. 这些坦克车下截设有不透水帆布围裙，以便漂浮，并特设螺旋桨，以便向海滩推进，登陆之后即可照正常操作。
美
[prə'pelə]
