Its oscillation depends on the strength of the gravitational field.
《柯林斯英汉双解大词典》
2
根据一种假设,这颗行星的重力场会对由尘埃和气体组成的原行星盘产生牵引力。
According to one hypothesis, the planet's gravitational field tugs on the protoplanetary disk of dust and gas from which it formed.
3
一旦地球经历了其形成的最后阶段,气体就会鼓泡到地表,并被地球的重力场控制,形成大气。
Once Earth had gone through the final stages of its formation, gases bubbled to the surface and were held by Earth's gravitational field to form the atmosphere.