"受引力作用" can be translated into English as "be subject to gravitational force" or "be influenced by gravitational pull".
Here are some example sentences to illustrate the usage:
1、 Planets in the solar system are subject to gravitational force from the sun.
(太阳系中的行星受到太阳引力的作用。)
2、 The moon orbits the Earth because it is influenced by the Earth's gravitational pull.
(月球绕地球运行是因为它受到地球引力的影响。)