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

预计将有大约 33 个这样的火箭发。

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20世纪70代就已经出现。

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

一百多前，戈达德对火箭发进行了研究和测。

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

1925，他制造并测了第一台使用软化学燃料的火箭发。

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

过去的20多里，俄罗斯向美国交付了120多个火箭发。

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。

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

航空母舰将其高空带入大气层，并火箭发点火之前将其释放。

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推力和效率水平的方法。

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

他们还会学习诸如火箭发如何推飞船，以及绝缘材料如何调节设备温度等知识。

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

中国已完成火箭发的重要测，该火箭发将用于首次火星任务。

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

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

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

过去 20 多里，俄罗斯已经向美国交付了 120 多个火箭发。

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

我感受到火箭发轰鸣，燃料爆发巨大能量，带着我们冲离地球。

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，火箭发可以为太空飞行器提供力。

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，将停止向此前交付美国的火箭发提供服务。

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, 其燃料消耗太高。

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料发的火箭发台。

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

火箭发和大量铝材中, 特斯拉展示了一款灰色的 Model S 轿车。

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

现，电涡轮泵循环是一种将颗粒泵入火箭发的完全不同的方式。

NASA said on its website that the problem was linked to difficulties cooling the rocket's main engines to the needed temperature for liftoff.

美国航空航天局其网站上表示，这个问题与难以将火箭主引擎冷却到发射所需的温度有关。