Clothes provide different levels of uv protection depending on many factors .

由于众多因素，衣服遮蔽紫外线的系数不同。

Exposure to uv rays can mutate your cells and cause cancer .

暴露在紫外光下会使你的细胞突变，引起癌症。

The glass or plastic covering , which protects the item from pollutants and dirt , should contain uv filtering .

那些可以保护其免受污染物质和脏污的损害的玻璃或塑料封套应该是防紫外线的。

They work by either chemically absorbing uv rays or deflecting and bouncing them off your body .

它们的工作原理要么是含有能吸收紫外线的化学物质，要么是使紫外线折射或色散，避开你的身体。

It 's dark green because they have this particular pigment protecting them from the access of uv light .

它是深绿色的，因为它们有这个特殊的色素保护自己从而不受紫外线的侵害。