Another frequency of light (UV) will cause our body to make melanin, the chemical that gives us a sun tan.

另外一种频率的光(UV)会促使我们的身体制造黑色素，这种化学物质会使我们晒黑。

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Another frequency of light (UV) will cause our body to make melanin, the chemical that gives us a sun tan.

另外一种频率的光(UV)会促使我们的身体制造黑色素，这种化学物质会使我们晒黑。

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