痂是皮肤损害内部或其表面的浆液、脓液或血液干燥后而形成的块状物，常含有红细胞、白细胞、脂类物质、细胞碎屑、细菌或真菌。痂的形成情况与皮损渗出物有关。不同原因导致的痂，其表现及治疗方式不同。
双语例句原声例句
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这个部位会非常疼痛，直到大约十天后结了痂为止。
The area can be very painful until scabs form after about ten days.
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最终你会结成一个痂，当它愈合的时候，它会脱落，然后你会留下一个伤疤。
Eventually you develop a scab, and then it would fall off as it healed, and you'd be left with a scar.
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只能让痂片自然脱落。
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This process, I said, this ancient process of taking scabs from patients and introducing them to people you wanted to protect, was called variolation.
这个过程,我想,这个从病人身上取痂,接种到你想保护的人身上的古老过程,叫做天花接种
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