实验结果说明不同硒化合物不仅能够清除细胞体系产生的活性氧自由基，而且对化学反应生成的活性氧自由基也有清除作用。

It is concluded that the different selenium forms can clear the active oxygen radicals produced from both cellular metabolism and chemical reactions.

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这些射线生成管也叫克鲁克斯管，通过在管道周围的裂缝处施加高达十万伏电压的方式，可以在其内部产生自由电子。

The tubes in which the rays were generated were known as Crookes tubes, which generated free electrons - then a topic of intense study - by applying a (DC) voltage of up to 100 kilovolts across a gap.

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