It can walk on the top of this pond because the particles that make up the water in the pond are all attracted to each other.

它可以在这个池塘的顶部行走，因为构成池塘水的粒子都相互吸引。

In his theory, Newton explained that every particle attracts every other particle with a force proportional to the product of their masses and inversely proportional to the square of the distance between the center of each particle.

在他的理论中，牛顿解释说，每个粒子都会吸引其他每个粒子，这种吸引力与它们质量的乘积成正比，与每个粒子中心之间的距离的平方成反比。