The way it works is that the entire rocket unit leaves Earth's atmosphere, and then the 15-story-tall rocket booster separates, flips and comes back to a landing zone six miles away.

它的工作方式是，整个火箭单元在离开地球大气层之前，15层楼高的火箭助推器完全分离并翻转，然后在六公里之外的着陆区重新着陆。

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Unit test is a key loop of rocket test.

单元测试是运载火箭测试的重要环节。

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The first native liquid-fueled rocket engine used a liquid oxygen and carbon-hydrogen propellant, provided 5.6 tons of thrust, and was installed in unit e.

第一个使用液氧碳氢推进剂的国产液体燃料火箭发动机被安装在了火箭的E段上，它可以提供5.6吨的推力。

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European engineers believe they could contribute to this project by providing the propulsion unit that pushes the rocket's capsule to these locations.

BBC: European tech could propel Nasa's Orion capsule

If the project is approved, engineers would hope to have the propulsion unit, or service module, ready to fly on the American rocket's first test flight.

BBC: European tech could propel Nasa's Orion capsule