Having too much oxygen in your body creates free radicals.

身体里过多的氧气会产生由基。

Free radicals are highly reactive chemical entities that can damage cells.

由基能破坏细胞的、有高反应活性的化学实体。

Free radicals which can oxidize cholesterol and thus lead to heart disease.

由基能氧化胆固醇，从而导致心脏病。

Meaning, when exposed to oxygen or heat, they can form toxic byproducts and free radicals.

意思，到氧或被加热时，多元不饱和脂肪酸极易产生有毒副产物及由基。

It can react with compounds in our bodies and create those free radicals.

它可以与我们体内的化合物反应，产生由基。

Because PAHs form with the help of free radicals, and antioxidants could slow down that process.

因为多环芳烃需要借助由基生成，而抗氧化物质能减缓这一过程。

It is unlike you to introduce such a free radical into an otherwise highly functional relationship.

让这样一个不稳定因素加入一个高功能性的关系中不像你会做的事。

And when artemisinin encounters hemozoin, the two compounds react to create unstable atoms known as free radicals.

青蒿素到疟原虫色素时，这两种化合物会发生反应，产生被称为由基的不稳定原子。

So when you heat vegetable oils, free radicals as well as small lipid fragments called aldehydes can form.

所以，被加热时，菜油会产生由基和一种名叫乙醛的脂质碎片。

And when it does this, the free radical changes the chemical structure of those molecules, sometimes damaging them.

它这样做时，由基会改变这些分子的化学结构，有时会破坏它们。

And even if antioxidants aren't overwhelmed, some free radicals still slip through, slowly damaging our cells year after year.

即使抗氧化剂没有被淹没，一些由基仍然会溜走，年复一年地慢慢破坏我们的细胞。

And a growing body of evidence shows that free radicals are involved in the signalling between cells.

越来越多的证据表明由基参与细胞之间的信号传递。

Also, remember to have lots of Vitamin C as it is a powerhouse of antioxidants and can combat free radicals.

此外，要记住摄入大量的维生素C，因为它抗氧化剂的强大力量，可以对抗由基。

If oxygen steals electrons from molecules in our bodies, it creates unstable molecules called free radicals that can damage cells.

如果氧气从我们体内的分子中窃取电子，它会产生不稳定的分子，称为由基，会损害细胞。

In order to get the process kicked off you have to introduce a free radical.

为了启动该过程， 您必须引入由基。

As a result, free radicals react extremely readily with other atoms — to the point where they can actually tear cells apart.

所以呢，由基极易与其他原子发生反应——以至于它们可以将细胞撕裂。

Indirectly, the rays also damage the area immediately surrounding the DNA, creating unstable particles called free radicals.

间接地，射线还会破坏紧邻 DNA 周围的区域，产生称为由基的不稳定粒子。

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

而且，这就他们的样子。 由基具有单个不成对电子的原子或离子。

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，但由基会破坏成对的电子。

So, while our bodies make the best of the situation, they also try to keep free radical damage to a minimum.

因此，在我们的身体充分利用这种情况的同时，它们也会尽量将由基的伤害降到最低。