propeller boss

例句：

1. 1.The propeller boss was responsible for thesmooth operation of the ship's engines.
   螺旋桨老板负责船舶引擎的平稳运行。
2. 2. The pilot boss had to make quickdecisions under pressure.
   飞行员老板必须在压力下迅速做出决定。
3. 3. The captain boss made sureall the crew members were well-rested before the long flight.
   船长老板确保所有船员在长途飞行前都休息好。