原子反应堆相对于自身的体积，提供了大量的能量，这将是设计太空系统的主要特性。
Fission reactors provide a lot of power for their size, which is a key attribute in designing space systems.
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。
However, the mainshortfalls of these types of vehicle are that they are often very largeand contain a lot of empty space.
由于帆的数量和船身大小的关系，商用单桅纵帆船的速度非常快，但由于他们较小的体积限制了他们不能携带大量的货物。
Because of the enormous amount of sail related to the ships size, merchant sloops were very fast, but due to their small size they couldn't take large amounts of cargo.
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