ulcerated
当皮肤遭受严重烧伤、创伤、感染及糖尿病顽固性皮肤溃疡等损害时，大面积皮肤缺损的修复成为棘手的难题。
When the skin suffers to the serious burns, wound, infection and diabetes unprogressive skin ulcerates etc, it become hard problem to repair and rebuild the big area skin defect.
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