| 单词 | 多级火箭 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔booster〕The primary stage of a multistage rocket that provides the main thrust for launch, liftoff, and initial flight.助推器：多级火箭的第一级，为发射、升空和最初飞行提供主要推力美国传统〔stage〕One of two or more successive propulsion units of a rocket vehicle that fires after the preceding one has been jettisoned.一节火箭：两级或多级火箭的推动器，往往前一个推动器被抛弃后下一个才点火发射美国传统 |
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