Light from a laser comes from the electrons which surround the nucleus of every normal atom.
来自激光器的光是围绕普通的原子核的电子产生的。
The normal atom has an exactly equal number of positive and negative charges, so that the atom as a whole is neutral.
正常原子中正负电荷数十完全相等的,所以从整体上看原子时中性的。
A subscriber (a server that's interested in a topic), initially fetches the Atom URL as normal.
订阅者(对主题感兴趣的服务器)最初仍照常提取Atom URL。
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