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- first stage booster rocket 第一节火箭
- Minutes after liftoff, mission control announced that the first stage booster had successfully separated from the rocket and that the flight was proceeding as planned. 起飞后数分钟，任务控制中心宣布第一级助推器和火箭成功脱离，飞行在按计划进行。
- She did the first stage of the trip by train. 她行程的第一段是乘火车的。
- third stage booster rocket 第三节火箭
- second stage booster rocket 第二节火箭
- The first stage of a rocket is thrown away only minutes after the take-off. 火箭的第一级在火箭起飞后仅仅几分钟就被扔掉。
- The first stage in the erosion cycle. 侵蚀的初期侵蚀圈的第一阶段
- The first stage was the Party's infancy. 第一阶段是党的幼年时期。
- She do the first stage of the trip by train. 她行程的第一段是乘火车的。
- The first stage in research is data collection. 研究工作的第一步是收集资料。
- We did the first stage of the trip by train. 旅行的第一段我们乘的是火车。
- Shortly after it lifted off in September 1992, its booster rocket fired to break out of Earth orbit, and the fragility of spaceflight intruded. 观察者号于1992年9月升空没多久，推进火箭开动要使它脱离地球轨道时，便暴露出此趟飞航的脆弱性。
- The EKV will immediately bank sharply to either the right or the left to avoid being hit from behind by the booster rocket. EKV会立刻向左边或者右边机动，以防止被后面的助推火箭撞击。
- China is in the first stage at present. 中国目前仍处于第一阶段。
- The first stage engineering has began construction. 一期工程开工建设。
- U.S. missile defense system engages and destroys the booster rocket, but the warhead explodes 150 kilometers above the earth. 美国飞弹防御系统出动，击毁了推进火箭，但弹头仍在地球上空150公里处引爆。
- The first stage of labor usually lasts ca. 2 hours. 第一产程通常持续约2小时。
- The EKV willimmediately bank sharply to either the right or the left to avoid being hitfrom behind by the booster rocket. 大气层外拦截器(EKV)会立刻向左边或者右边倾斜，以防止被后面的助推火箭撞击到。
- We've succeeded in the first stage, more or less. 在第一个阶段我们大体上算成功了。
- Three minutes into its flight (approximately 1,400 miles from its target), the EKV will separate from the third-stage booster rocket. 飞行三分钟后（大约离目标1400英里），EKV会从三级助推火箭上分离。
