螺旋推进机 luóxuántuījìnjī screw propeller Origin Definitions Defs Strokes Stroke Words Sentences Sents 螺旋 luóxuán screw screw; a simple machine consisting of a threaded cylinder and a matching hole used to apply force or move objects推进机 推進機 tuījìnjī propeller propeller for a ship or plane; propulsion unit; thruster