shell electron

例句：

1. 1. The shell electrons in the outer space are constantly moving and interacting with each other.
   太空中的外壳电子不断移动和相互作用。
2. 2. The shell electrons of the atoms are responsible for their electrical properties.
   原子的壳电子负责它们的电学性质。
3. 3. The shell electrons can be used to create new materials and technologies.
   壳电子可以用来创造新材料和技术。