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

预计将有大约 33 这样的发动机。

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引擎在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，戈达德对发动机进行了研究和测试。

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

1925，他制造并测试了第一台使用软化学燃料的发动机。

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

在过去的20多里，俄罗斯向美国交付了120多发动机。

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

但关图像的专家表示，他们认为朝鲜进行的是发动机试验。

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，并在发动机点之前将其释放。

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发动机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.

他们还会学习诸如发动机如何推动飞船，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.

中国已完成发动机的重要测试，该发动机将用于首次任务。

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 台引擎，以在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 多发动机。

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

我感受到发动机轰鸣，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，发动机可以为太空飞行器提供动力。

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发动机提供服务。

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发动机, 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动机的发动机试验台。

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

在发动机和大量铝材中, 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.

现在，电动涡轮泵循环是一种将颗粒泵入发动机的完全不同的方式。

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

美国航空航天局在其网站上表示，这问题与难以将主引擎冷却到发射所需的温度有关。