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。

Rocket engine exhaust contains gases and particles that can affect Earth's climate and ozone layer.

火箭发动机的尾气中含有能影响地球气候臭氧层的气体颗粒物。

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火箭引擎在20世纪70年代就已经出现。

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

一百多年前，戈达德对火箭发动机进行了测试。

Free itself from the parachute; perfectly fire eight rocket engines to slow final descent; drop down, dangling on four cables; lock its wheels in place just before landing; and cut the cables right at the moment of touchdown.

从降落伞中挣脱出来；完启动 8 个火箭发动机以减缓最终降；，在四根缆绳上；在着陆前将轮子锁住；在着陆的瞬间切断缆绳。

The U.S. space agency cited a problem detected on one of the rocket's main engines, after launch teams had begun filling the rocket's core fuel tanks with liquid oxygen and hydrogen propellants.

国航天局称，在发射小组开始向火箭的核心燃料箱注入液氧氢气推进剂之后，火箭的一个主引擎被检测到了问题。

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，莫斯科决定停止对国供应火箭发动机，回应国因乌克兰问题对俄罗斯实施的制裁。

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。

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

国航空航天局在其网站上表示，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。

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，火箭发动机可以为太空飞行器提供动力。

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机的重要测试，该火箭发动机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一代降落伞 12 台火箭引擎，以在降过程中减缓着陆器的速度。

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，以及绝缘材料如何调节设备温度等知识。

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，并在火箭发动机点火之前将其释放。

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动机推力效率水平的方法。

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料的火箭发动机。

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

在过去的20多年里，俄罗斯向国交付了120多个火箭发动机。

So, the sort of central principle behind the engine that we're working on is to basically synthesize a rocket engine with an air-breathing engine like a jet engine.

因此我们采用这种引擎的理念是将火箭的发动机同如喷气发动机等的吸气式发动机结合。