mutual affinity

• 相互吸引

mutual affinity的用法和样例：

例句

1. Astronomers had generally assumed it must be decelerating, because galaxies attract one another gravitationally and should retard their mutual separation.
   天文学家一向认为宇宙应是减速膨胀的，因为重力作用使星系相互吸引，应该会减缓它们彼此分离的速率。