However, the mainshortfalls of these types ofvehicle are that they are often very largeand contain a lot of empty space.
然而，这些设计的主要缺陷在于，这些宇宙飞船通常体积很大，其中包含了大量无用的空间。
2
A rover prototype, the Space Exploration Vehicle, which is the size of a pickup truck, has a pressurised cabin in which crew can live for up to 14 days.
该款太空探索运载器的原型大小如一台小卡车，携带的加压舱可以让机组乘员生活长达14天的时间。
3
The new spacevehicle design USES shuttle rocket parts, an Apollo-style capsule and a lander capable of carrying four people to the moon.