Van der Waals attraction

例句：

1. 1. Theattraction between two molecules is what makes them stick together.
   两个分子之间的吸引力使它们结合在一起。
2. 2.The Van der Waals force is responsible for the way particles repel each other.
   范德华力是导致粒子相互排斥的原因。
3. 3. The attraction of a magnet to iron is due to the magnetic field it generates.
   磁铁对铁的吸引力是由于它产生的磁场。