columnar epithelium的用法和样例：
例句
- Simple columnar epithelium consists of tall, narrow cells having considerably greater height than width.
单层柱状上皮由高桂状上皮细胞组成，细胞的高度显著大于细胞的宽度。 - Epithelium also lines the air tubes and lung cavities.
上皮组织还衬盖气管和肺腔。 - Thus we find that they, too, arise from an epithelium.
因此我们发现，它们也起源于上皮组织。
