求翻译：apply activator serum onto fingertips adding a thick layer directly over the entire derma-crystal mask. you will see a white foam appear releasing conditioners to your skin's surface. it is normal to experience a warming sensation.ifdesired,continue adding activator serum for more foam as the crystals dissolve.gently massage for up to 1 minute.rinse thoroughly with warm water,using a washcloth for best results.是什么意思？

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