Most axons in adult nerve tissue are ensheathed by single or multiple folds of a sheath cell. 成年人神经组织的大多数轴突外面都包裹着一层或多层鞘细胞。
A paleontologist in Aus, Namibia, makes a mold of a Pteridinium by brushing multiple layers of latex on the fossil. 纳米尼亚奥斯镇，一位古生物学家在化石上刷制多层抛光乳胶浇铸了一个前寒武纪的化石模型。
