一、請將下列英文譯為中文：（25 分） The handling characteristics of a ship fitted with a variable pitch propeller are significantly different from those with a fixed blade propeller. Variable pitch propulsion systems have advantages since a diesel engine so fitted does not have to be stopped and restarted to go astern, and almost infinite choice of speeds is available. Further, you can go astern indefinitely which isn’t possible for a turbine driven ship, and unlike a conventional motor ship, you can change the direction of propulsion repeatedly without concerning about exhausting the supply of starting air.