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。
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。
The ribosomes, made up of RNA and protein, are found either lining the endoplasmic reticulum or free within the cell.
核糖体由蛋白质和RNA组成，有的排列在内质网上，有的则在细胞中呈游离状态。
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