multistage

名词 multistage:

1. occurring in more than one stage

mul.ti.stage

adj.（形容词）
Functioning in more than one stage:
多级的：在多层级上起作用的：
例句：
a multistage design project.
多级设计方案

Relating to or composed of two or more propulsion units.
多阶段的：有关两种或者多个推进器的、或者由其组成的