propel /prəˈpel/ vt. 推进，推动，激励：The wind propels a sailing boat. 风推动帆船前进。［考句］Under the guidance of their teachers, the pupils are building a model boat propelled by steam.在老师的指导下，学生在作蒸汽推动的船模。

propeller n. [c] 螺旋桨；推进器：The propeller started to spin around.螺旋桨开始飞快地旋转起来。