One impetus for the policy is that companies are already starting to build massive constellations, comprising hundreds or thousands of satellites with many moving parts among them.
2019年6月六级真题（第二套）阅读 Section C
柯林斯高阶英汉双解学习词典释义
VERB
包括;由…组成
If you say that something comprises or is comprised of a number of things or people, you mean it has them as its parts or members.