hard propellant

• 固体推进剂

hard propellant的用法和样例：

例句

1. We shall try by means of a highly simplified development to expose certain advantages and disadvantages of solid propellant rocket systems.
   我们想通过相当简单的推导来试图阐明固体推进剂火箭系统的某些优缺点。
2. The pasty propellant is a new kind of chemical propellant derived from solid propellant.
   膏体推进剂是由固体推进剂衍变而成的一种新型化学推进剂。