pearl layer

• 底层；壳下层

pearl layer的用法和样例：

例句

1. Spread the quark cream on the bottom layer and cover with the almond top.
   晾凉后蛋糕底分两层，底层铺上乳酪奶油糊，盖上杏仁层。
2. The histopathologic study of skin showed hyperpigmentation in the basal layer of the epidermis.
   皮肤之组织病理学检查显示表皮基底层色素增加。