Any two masses, regardless of size, exert an attraction on one another. 任何两个质体，无论大小都会互相吸引。
The tweezer array showed successfully that the same attraction that occurs between a pair of similarly charged particles is also present in large clusters of them. 光钳阵列成功地显示出，带同性电的粒子群之间，也会发生如同一对带同性电粒子之间互相吸引的现象。
