求翻译：　　在使用者对某种品牌的面霜、化妆水、营养液、乳液等产品的成分不了解时，决不能随意混合使用，以避免不同品牌的产品发生不良反应，伤害肌肤。是什么意思？

Users of a certain brand of face cream, lotion, nutrient solution, lotion and other products of the ingredients do not know, must not at liberty to mix in order to avoid the products of different brands of adverse reactions, damage the skin.

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　　In the user to some kind of brand facial cream, puts on make-up product and so on water, nourishing cream, emulsion ingredients does not understand time, can mix the use at will in no way, avoids the different brand the product occurring responded not good, injures the flesh.

　　Users on a certain brand of face cream, make-up water, liquid, lotion and other products of the components when you do not know, and must not be free to mix, to avoid adverse reactions for different brands of products, harm to the skin.