Balance the water and oil, supplement moisture, clean skin, regulate skin stone and delay the aging of skin.

维持水油平衡，补充水分，净爽肤质，达到调理脸部气色，减缓肌肤的老化。

youdao

Since all forms of potassium alum are soluble in water, when the stone is wet or applied to wet skin, an invisible, fine layer of the mineral is rubbed off the stone and applied to the skins surface.

因为各种状态的钾明矾都能溶于水，当把它弄湿或接触湿皮肤时，会有一层肉眼看不见的细腻矿物层从钾明矾表面脱落，吸附到皮肤表面。

youdao

He still had his face in his hand, and he was as still as if he'd been carved from the stone his skin resembled.

他依然把脸藏在手掌之下，一动不动，就好像他是由和他的肌肤相似的石头雕刻出来的一样。

youdao

Each joint was crowned with a little gray stone of skin, and each heel was like the battered end of a club.

NEWYORKER: Naima

Stones that are resistant to lithotripsy may be treated with a surgical procedure known as a percutaneous nephrolithotomy, in which an instrument is passed through the skin into the kidney to grab and break up or remove the stone.

CNN: What can I do for kidney stones?