As for the space shuttle main engines, those are now free.
航天飞机的主发动机现在是免费的。
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。
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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