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火箭引擎20世纪70年代就现。

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

过去的20多年里，俄罗斯向美国交付了120多个火箭发动机。

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

比冲是一种秒为单位测量火箭发动机推力和效率水平的方法。

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，并火箭发动机点火之前将其释放。

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动机如何推动飞船，及绝缘材料如何调节设备温度等知识。

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一代降落伞和 12 台火箭引擎，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 多年里，俄罗斯向美国交付了 120 多个火箭发动机。

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

中国完成火箭发动机的重要测试，该火箭发动机将用于首次火星任务。

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，火箭发动机可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火箭发动机提供服务。

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火箭发动机试验台。

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机, 其燃料消耗太高。

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，这个问题与难将火箭主引擎冷却到发射所需的温度有关。

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

现，电动涡轮泵循环是一种将颗粒泵入火箭发动机的完全不同的方式。

So, we needed to come up with a whole new process and a whole new cycle for the rocket engine.

因此，我们需要为火箭发动机提一个全新的流程和一个全新的循环。

The structure is meant to protect the concrete pad, the rocket's support structure, from being damaged from the heat and force of the rocket's engines.

这个结构是为了保护火箭的支撑结构——混凝土发射台，避免被火箭发动机的热量和能量损坏。

Russian media reported that Moscow has decided to stop supplying rocket engines to the United States in retaliation for the sanctions imposed against Russia over Ukraine.

据俄罗斯媒体报道，莫斯科决定停止对美国供应火箭发动机，回应美国因乌克兰问题对俄罗斯实施的制裁。