Most lasers in use, however, are low power types. They are far from being the death rays of science fiction.

然而，使用中的大多数激光器都是低功率类型的，它们远非科学幻想小说中的死光。

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Until quite recently, scientists believed that most gamma-rays are produced by cataclysmic events in distant galaxies, such as the death of supermassive stars.

直到最近，科学家们才相信，大部分的伽马射线是由遥远星系中剧烈的宇宙活动产生的，比如超大质量恒星的死亡。

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Citrus also contains bioflavonoids, which protect skin from UV rays and help prevent cell death.

柑橘类水果还含有生物黄酮素，能够保护皮肤不受紫外线的伤害，并防止细胞坏死。

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Citrus also contains bioflavonoids, which protect skin from UV rays and help prevent cell death.

柑橘类水果还含有生物黄酮素，能够保护皮肤不受紫外线的伤害，并防止细胞坏死。

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