jet pack短语⁵²⁸⁰⁵ 基本例句 喷气发动机组件 As thousands looked on Tuesday, the inventor's16-year-old son donned a helmet, fastened himself to a prototype Martin jet pack and revved the engine, which sounded like a motorcycle. 周二，成千观众目睹了发明家16岁的儿子带上头盔、将自己绑在这个“马丁”喷气飞行器上，然后把引擎发动。引擎发出的声音如同摩托车。 bbs.chinadaily.com.cn