All that glitters is not gold, but it must have free electrons.
并非所有发光的都是金子，但是要发光必须有自由电子。
Liquids, which contain no free electrons, are poor conductor of electricity.
液体由于没有自由移动的电子因而是电的不良导体。
This is in addition to general absorption characteristic of the free electrons.
这是附加在自由电子的普通吸收之上的。
This is in addition to general absorption characteristic of the free electrons.
这是附加在自由电子的普通吸收之上的。
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