And all of your epithelial tissues are avascular — meaning they don't have a blood supply.

你所有的上皮组织都是无血管的，着们没有血液供应。

Later, they get stuck in other bones, causing sickle cell pain crises or avascular necrosis of the bone.

随后，们嵌顿在其骼，造成镰状细胞疼痛危象或骼无血管坏死。

They can also cause avascular necrosis of certain regions within the bone, if the tumor impinges on a major blood vessels.

肿瘤侵犯到主要血管，肿瘤还会造成骼内某些区域无血管坏死（AVN）。

Most cartilage is avascular, for example, meaning it has no blood vessels; while other types of connective tissue, like the dense irregular tissue in your skin, is brimming with blood vessels.

例，大多数软是无血管的，着没有血管；而其他类型的结缔组织，皮肤中致密的不规则组织，充满了血管。