The superficial epithelia cells do not bind the active ingredient and thus only serve as a transit area.

浅表的上皮细胞并不与活性药物成分结合，因而只是运输区。

youdao

The superficial epithelia cells do not bind the active ingredient and thus only serve as a transit area.

浅表的上皮细胞并不与活性药物成分结合，因而只是运输区。

youdao