皮肤的层次（Layers of the skin） （1,2,3,4） 皮肤由外而内大致分为表皮、真皮和皮下组织三层，另外有一些 附属器官，如毛发、指甲、皮肤腺体（汗腺、皮脂腺）等...
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皮肤还提供比主题提供的导航层次更深的导航。
Skins also provide navigation to levels deeper than the navigation that is provided by the themes.
皮瓣是指自身带有血供，包括皮肤与皮下组织或更深层次组织在内的复合组织块。
The skin flap is a compound tissue mass with blood supply of its own, including skin and subcutaneous tissue or the deeper level of tissue.
例如说：第一个时期，身体能量充满你的皮肤层次。
For example: the first times, your skin nadis would be full of energy.
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