n.下皮，真皮...

With the elasticity of dermis and hypodermis increased, the wrinkle will be weaken.要减少皱纹,就要提高真皮及皮下组织的弹性....

hypodermis的音标：hypodermis的英式发音音标为：[ˌhaɪpə'dɜ:mɪs]hypodermis的美式发音音标为：[ˌhaɪpə'dɜmɪs]...