Electrons love travelling in pairs and are most stable that way, but free radicals have unpaired electrons.

电子喜欢成对活动，并且它在这种模式下最稳定，但是自由基会破坏成对的电子。

To put it chemistry specific, it has two unpaired electrons, which really want to form chemical bonds.

具体到化学，它有两个不成对的电子，它们真的想形成化学键。

When unpaired electron spins line up parallel to each other, you get ferromagnetism, or a mineral that's an actual magnet.

当未配对的电子自旋互相平行时，你将见到铁磁性，或者一个实际上是磁体的矿物。

The process also creates radicals — molecules with one or more unpaired outer electrons.

该过程还会产生自由基——具有一个或多个不成对外层电子的分子。

And, that's kinda what they are. Free radicals are atoms or ions that have a single unpaired electron.

而且，这就是他们的样子。 自由基是具有单个不成对电子的原子或离子。

These molecules have unpaired electrons, driving them to steal electrons from nearby cells and cause permanent damage to the inner ear.

这些分子具有不成对的电子，驱使它们从附近的细胞中窃取电子并对内耳造成永久性损伤。

That’s because stress can increase levels of free radicals—atoms or molecules that have an unpaired electron, which makes them unstable and very reactive.

那是因为压力会增加自由基的水平——具有不成对电子的原子或分子， 这使得它们不稳定且非常活泼。

And, in the case of addition polymerization it attacks the double bond and joins one of the carbons, while the other carbon is itself left with an unpaired electron.

而且，在加成聚合的情况下， 它会攻击双键并连接一个碳，而另一个碳本身会留下一个未配对的电子。