问题:
Every object in the universe pulls on every other object. This is called gravitation, or gravity. But the strength of that pull--of gravity--depends on two things.
[判断题]宇宙中的任何一个物体对另一物体产生一种拉力,这就叫引力,或(者)万有引力。但其拉力(引力)的强度取决于两个因素。
答案解析: