两个孩子不能照射任何的紫外线光，否则他们极容易患上皮肤癌。

The boys could not be exposed to any ultraviolet rays, or they ran the risk of almost certain skin cancer.

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现在有一个植物生理学家的团队已经研究出一种方法，这种方法就是通过用紫外线发光二极管使莴笋颜色更深更红(因此更健康)。

Now a team of plant physiologists has developed a way to make lettuce darker and redder-and therefore healthier-using ultraviolet light-emitting diodes (LEDs).

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紫外线发光二极管则可以提供一种方式来提高电磁频谱的一部分，从而生产出颜色更深、更多姿多彩的莴苣。

Ultraviolet LEDs could provide a way to replace and enhance this part of the electromagnetic spectrum to produce darker, more colorful lettuces.

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