第一，我们身体其他部位的肌肤有一层“保护层”，这是嘴唇所没有的。 “保护层”能有效保湿，嘴唇因为没有而不易保湿。

This layer is part of the barrier to evaporation, and its absence means our lip skin retains less fluid.

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其有效部位包括身体腰以上的任何部位，包括头部。

And the target areas include any part of the body above the waist, including the head.

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其有效部位包括身体腰以上的任何部位，包括头部。

And the target areas include any part of the body above the waist, including the head.

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