epithelium 上皮 columnar epithelium 柱状上皮 An epithelium that consists of columnar epithelial cells. Columnar epithelia are epithelial cells whose heights are at least four times their width. Columnar epithelia are divided into simple (or unilayered), and the rarer stratified (or multi-layered).[WP, modified] 由柱状上皮细胞组成的上皮。柱状上皮是高度至少是其宽度四倍的上皮细胞。柱状上皮分为简单的（或非层状的）和较少的分层的（或多层的）。[WP，modified]