Gravity is an attractive force between any two masses.

重力是任何两个物体之间的引力。

And there's attractive forces between the water molecules holding the drop together.

同时还有水分子之间将水滴保持在一起的吸引力。

Gravity is the attractive force between two objects with mass— any two objects with mass.

重力是两个有质量的物体之间的吸引力— —任何两个有质量的物体。

The molecules bind because of Van der Waals forces, the weak attractive force between uncharged molecules.

分子结合是因为范德华力， 即不带电分子之间的弱吸引力。

And so the ball is in the field of gravity for Earth and experiences an attractive gravitational force.

因此，球处于地球的引力场中，并受到引力的吸引。

So, it generates a huge attractive force.

所以，它产生了巨大的吸引力。

We said they are attractive forces, and that they exist between all objects with mass.

我们说它们是吸引力，它们存在于所有有质量的物体之间。

Gravity is an attractive force, so objects with mass want to move towards the surface of the Earth.

重力是一种吸引力，因此具有质量的物体想要向地球表面移动。

Now, if you increase the number of carbons, you're going to increase the number of attractive forces that are possible.

现在，如果你增加碳的数量，你就会增加可能存在的吸引力的数量。

For really tiny animals, all they need to do is take advantage of water's strong surface tension, an attractive force between molecules on a liquid.

对于非常小的动物来说， 它们所需要做的就是利用水强大的表面张力，即液体分子之间的吸引力。