Repeat the above steps 7 and 8 to register another frequency to the next channel.
重复上述第7和第8步骤把另一频率登记到下一个频道。
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。
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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