Retrorocket
n. 制动[减速]火箭系统
🗣️ 情景例句
Please wait a second.
请稍等。
Good wine needs no bush.
酒好客自来。
Precautions of this sort are necessary, for it is impossible to foretell the exact nature of the difficulties which will confront the pot-holer.
作出这样的准备是必要的，因为无法预见到洞穴探险者究竟会遇到什么性质的困难。