而当它们达到地球的表面时，它们就与空气反应——把空气的分子转变成为称作为离子的带电粒子。
And when they arrive at the Earth's surface they react with the air - converting air molecules into charged particles known as ions.
自由基是一类带电荷的原子、分子或离子，具有很强的生物活性，在肿瘤和其它许多疾病的发生过程中起重要作用。
Free radicals are a group of charged atoms, molecules or ions with strong biological activity, which play an important role in pathogenesis of cancers and many other diseases.
负离子是带电的氧和空气中的水分子结合在一起产生的。
Negatively charged oxygen combines with fine water particles to become negative ions.
负离子是带电的氧和空气中的水分子结合在一起产生的。
Negatively charged oxygen combines with fine water particles to become negative ions.
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