土星

Astronomers used to ask why only Saturn has rings.

天文学家们过去一直感到奇怪，为什么只有土星有光环。

The Saturn family of launch vehicles falls into three types or groups.

“土星族”飞行器可以分为三类或三组。

Numerical examples are mostly taken from studies of the Saturn V vehicle.

数值例子大多数取自“土星V”飞行器的研究。

These comparisons suggested that Saturn is made of lighter materials.

这些比较告诉我们，土星由较轻的物质构成。

The Saturn I launch vehicles consisted of two types or blocks.

“土星Ⅰ”发射飞行器包括两类或两个组合。