Of or relating to or caused by gravitation中of or 什么意思?

Of or relating to or caused by gravitation中of or 什么意思?
Of or relating to or caused by gravitation中of or 什么意思?

Of or relating to or caused by gravitation中of or 什么意思?
of 后面还有一个or吗?没见过这样用的.
relating to or caused by gravitation 与重力有关,或由重力导致的.