That the force that causes the apple to fall to the ground is the same force that causes the planets and the moon to move around, and so on? Everybody knows that. It's a property of gravitation.
把苹果吸向地面的力 很有可能和使月球和行星运动的力是一致的， 等等？每个人都知道。它就是万有引力的性质。