迄今为止，只有火箭才能推进宇宙飞行器。

Up to now, it is only the rocket which can propel a space vehicle.

youdao

宇航员们使他们的宇宙飞行器在外层空间对接并开始交换货物。 ?。

Thee astronauts docked their space vehicles and began to exchange cargo.

youdao

宇航员们使他们的宇宙飞行器在外层空间对接并开始交换货物。 ?。

Thee astronauts docked their space vehicles and began to exchange cargo.

youdao