维生素a可以平衡皮肤表面的PH值至弱酸性，从而有效抵抗细菌的入侵。
It helps balance the PH of the skin's surface, making it slightly acidic. That's good news, because slightly acidic skin fends off bacterial invaders.
维生素a可以平衡皮肤表面的PH值至弱酸性，从而有效抵抗细菌的入侵。
It helps balance the PH of the skin's surface, making it slightly acidic. That's good news, because slightly acidic skin fends off bacterial invaders.
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