大家在查： bomboo pillow case Albrizio strickled 圣潘克拉斯臭名昭著了 Htein SwedBIO neuronscells 罪孽降

ultraviolet B-rays

ultraviolet B-rays

ultraviolet B-rays

ultraviolet B-rays

1

The sun 's ultraviolet -B rays absorbed through the skin are the body's main source of this nutrient.

人体获得维生素 D 的主要来源是通过皮肤吸收太阳的中波紫外线。

3

However , people need to exercise caution since the sun 's ultraviolet B rays also can cause skin cancer ;

然而，实际操作中则要小心，因为太阳的紫外线 B 能导致皮肤癌；

热词推荐

大家在看