Regions of the body that are most vulnerable to radiation damage include the cells lining the intestine and stomach, and the blood-cell producing cells in the bone marrow.
一些人体区域对辐射产生的破坏异常敏感，这些部位包括肠部和胃部上的细胞，还有骨髓中的造血细胞。
2
Simple cuboidal epithelium lining a tubule (longitudinal cut). Some of the cell boundaries between "blocks" or "cubes" here are quite distinct.
管腔纵切面：单层立方上皮衬于管腔内。一些立方细胞之间的边界相当清晰明显。
3
The ribosomes, made up of RNA and protein, are found either lining the endoplasmic reticulum or free within the cell.