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

预计将有大约 33 个这样的火机。

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火引擎在20世纪70年代就已经出现。

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多个火机。

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，并在火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机如何推飞船，以及绝缘材料如何调节设备知识。

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下一代降落伞和 12 台火引擎，以在下降过程中减缓着陆器的速。

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 多个火机。

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

中国已完成火机的重要测试，该火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.

我感受到火机轰鸣，燃料爆巨大能量，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，火机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液体燃料机的火机试验台。

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.

美国航空航天局在其网站上表示，这个问题与难以将火主引擎冷却到射所需的有关。

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

现在，电涡轮泵循环是一种将颗粒泵入火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，我们需要为火机提出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的支撑结构——混凝土射台，避免被火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机，回应美国因乌克兰问题对俄罗斯实施的制裁。