Similarly, our own present primitive chemical rockets, though good enough to orbit men.

同样，我们目前使用的原始化学火箭，虽然把人送入轨道。

youdao

Similarly, our own present primitive chemical rockets, though good enough to orbit men.

同样，我们目前使用的原始化学火箭，虽然把人送入轨道。

youdao