We have other ways of protecting; many of our cells are inside our body protected by specialized cells of our skeletal system.

人类有其它的保护机制,我们体内的细胞受,特化的骨骼细胞保护

耶鲁公开课 - 生物医学工程探索课程节选

Fibroblasts are specialized cells that exist in connective tissues.

成纤维细胞是,出现在结缔组织中的特化细胞

耶鲁公开课 - 生物医学工程探索课程节选

I'm not going to talk about them in detail but please look at that to remind yourself of those kinds of specialized sub-cellular units which are present in cells in humans but not present in bacteria.

我就不再赘述了,不过请你们看看书,回忆一下哪些特化的亚细胞结构单元,是人类细胞有,而细菌没有的

耶鲁公开课 - 生物医学工程探索课程节选