But the relatively low amount of energy that they can deliver for a given mass of fuel is a severe drawback when dispatching spacecraft over long distances.

但是，在所用燃料量相同的情况下，化学燃料火箭所提供的能量较低，将宇宙飞船进行远距离发送时，这一点就是一个严重的缺陷。

youdao

But the relatively low amount of energy that they can deliver for a given mass of fuel is a severe drawback when dispatching spacecraft over long distances.

但是，在所用燃料量相同的情况下，化学燃料火箭所提供的能量较低，将宇宙飞船进行远距离发送时，这一点就是一个严重的缺陷。

youdao