They could power electrically driven wheels, letting an aircraft taxi without using its main engines.

它们可以给电力驱动的起落架轮子动力，让飞机不用主引擎就能在地面滑行。

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They would be built from shuttle booster rockets, fuel tanks and main engines, as well as moon rocket engines.

新型运载火箭将由飞船助推火箭、燃料箱、主发动机以及月球火箭发动机组成。

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The sensor system is one of several that protect the shuttle's main engines by triggering their shut down if fuel runs unexpectedly low.

该传感器系统是数个保护航天飞机主引擎的系统之一，如果燃料过低，则该系统将触发关机。

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France and Germany helped found the European Union and are still considered the main engines driving the 27-member bloc.

VOA: standard.2009.11.11

They could power electrically driven wheels, letting an aircraft taxi without using its main engines.

ECONOMIST: Electric planes

They are one of the main engines that drive job creation and economic growth in our country.

FORBES: Washington D.C. Needs More Entrepreneurs

To do this, the computers on board the ISS ignite two of the freighter's four main engines, generating a total thrust of 1, 000 newtons.

BBC: Freighter boosts altitude of ISS