Atoms in the solder joints move as a result of both diffusion and electromigration 另一方面，扩散和电迁移效应，则造成焊点中的原子移动。
2.
We also considered the physical sorting of different isotopes that sometimes takes place : heavier atoms move a bit more slowly than their lighter counterparts and can thus sometimes separate from them 我们还考虑了有时会将各种同位素排序分离的物理过程：较重的原子移动得比较慢，有时会因此与较轻的原子分离。
