| 单词 | primary stage |
| 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〔primary〕In the US 90 per cent of these cancers would be caught at the primary stage.在美国, 这些癌症中有90%都能在早期发现。外研社新世纪〔primary〕The disease is still in its primary stage.这病尚处于初始阶段。牛津高阶 |
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