激子

例句：

1. 1. The electron is a tiny particle that can move through space.
   电子是一种可以穿过空间的微小粒子。
2. 2. Photons are the building blocks of light.
   光子是光的基本构成单位。
3. 3. The quantum theory explains how particles behave in the presence of electromagnetic fields.
   量子理论解释了粒子在电磁场中的行为。