1.It's predicted to have about 33 of these rocket engines.

有大约 33 个这样的火箭发动。

2.It's not new. NASA's RS-25 rocket engine has been around since the 1970s.

这不是什么新鲜事物。NASA的RS-25火箭引擎在20世纪70年代就已经出现。

3.More than one hundred years ago, Goddard carried out studies and tests of rocket engines.

一百多年前，戈达德对火箭发动进行了研究和测试。

4.In 1925, he made and tested the first rocket engine using a soft chemical fuel.

1925年，他制造并测试了第一台使用软化学燃的火箭发动。

5.Russia has delivered more than 120 rocket engines to the U.S. over the past 20-plus years.

在过去的20多年里，俄罗斯向美国交付了120多个火箭发动。

6.Specific impulse is a method for measuring – in seconds –thrust and efficiency levels of rocket engines.

比冲是一种以秒为单位测量火箭发动推力和效率水平的方法。

7.But experts looking at satellite imagery say that they believe that it was a rocket engine test.

但关注卫星图像的专家表示，他们认为朝鲜进行的是火箭发动试验。

8.A carrier aircraft carries it high into the atmosphere and releases it before its rocket engine fires.

航空母舰其高空带入大气层，并在火箭发动点火之前其释放。

9.They'll learn things such as how the rocket engine propels the craft and how insulation regulates equipment temperature.

他们还会学习诸火箭发动何推动飞船，以及绝缘何调节设备温度等知识。

10.The lander design concept incorporates next-generation parachutes and 12 rocket engines to slow the lander down as it descends.

这款着陆器设概念融入了下一代降落伞和 12 台火箭引擎，以在下降过程中减缓着陆器的速度。

11.Russia has delivered more than 120 rocket engines to the U.S. over the past 20 years plus.

过去 20 多年里，俄罗斯已经向美国交付了 120 多个火箭发动。

12.China has completed an important test of the rocket engine that will be used in its first Mars mission.

中国已完成火箭发动的重要测试，该火箭发动用于首次火星任务。

13.I felt every single bit of the controlled fury of those rocket engines as they blasted us off the Earth.

我感受到火箭发动轰鸣，燃爆发巨大能量，带着我们冲离地球。

14.A Russian teacher of that time, Konstantin Tsiolkovsky, decided that a rocket engine could provide power for a space vehicle.

当时，俄罗斯一位老师——康斯坦丁·齐奥尔科夫斯基认为，火箭发动可以为太空飞行器提供动力。

15.Russian state space agency Roscosmos also says it will stop servicing rocket engines it had previously delivered to the U.S.

俄罗斯国家航天局还表示，停止向此前交付美国的火箭发动提供服务。

16.The parts include a rocket engine test stand used to develop liquid-fuel engines.

这些部件包括用于开发液体燃发动的火箭发动试验台。机翻

17.Amid rocket engines and hunks of aluminum, Tesla showcased a gray Model S sedan.

在火箭发动和大量铝中, 特斯拉展示了一款灰色的 Model S 轿车。机翻

18.The fundamental problem is that a state of the art rocket engine, its performance in terms of its fuel consumption is too high.

最根本的问题是一台最先进的火箭发动, 其燃消耗太高。

19.Now, the electric turbo pump cycle is a totally different way to pump the pellets into the rocket engine.

现在，电动涡轮泵循环是一种颗粒泵入火箭发动的完全不同的方式。机翻

20.SpaceX manufactures between 80 percent and 90 percent of its rockets, engines, electronics, and other parts.

SpaceX公司生产80%到90%的火箭、发动、电子设备和其他部件。机翻