a device worn on the back that uses gas or water to push someone into the air, especially an astronaut (= a person trained to travel in space)

For many, the jetpack will forever be associated with the master of gadgets, James Bond. 对许多人来说，喷气背包将与堪称“小工具大师”的詹姆斯 · 邦德永远联系在一起。