The integumentary system (which includes hair and nails) is often the first place that a serious vitamin deficiency shows up.

当维生素缺乏时，首先会变现在表皮系统（包括毛发和指甲）。

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The integumentary system (which includes hair and nails) is often the first place that a serious vitamin deficiency shows up.

当维生素缺乏时，首先会变现在表皮系统（包括毛发和指甲）。

youdao