这是用来阻挡太阳直射光线的。

This was intended to exclude the direct rays of the sun.

《柯林斯英汉双解大词典》

分析表明，溶解的有机物质吸收了足够的来自太阳光线的蓝色波长，使冰看起来是绿色的。

Analysis shows that the dissolved organic material absorbs enough blue wavelengths from solar light to make the ice appear green.

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随着我们年龄的增长，眼睛的晶状体变厚，因此对光线的折射也会发生变化。

As we age, the lenses of the eyes thicken, and thus refract light differently.

《柯林斯英汉双解大词典》