By the use of group action and normal covering we give an answer in some conditions from topological rigidity theorem in this article.
本文通过群作用和正则覆盖，利用拓扑刚性定理对此问题给出一个判定性条件。
If you have a normal thickness of bone, which is about 0.6 or 0.7 millimeter covering the superior canal, that's very unlikely to ever erode.
如果你有正常厚度——大概0.6 ~ 0.7毫米——的骨头覆盖上半规管，那就很难发生病变了。
Normal style: exposure suit is designed with a sharp-angled or ring neckline, collocated with gallus trousers or apron, with free breath holes covering back and oxter; or dust coat.
领口采用尖角或环型设计，下装配有背带裤或围裙设计，背片和腋下开创覆盖式透气孔设计，亦有大褂风衣设计，总之可以根据客户需要进行设计和研制。
Methods Using normal or self-made skin expander, intraoperative sustained skin expansion was done so as to gain "additional" tissue for covering wound surface.
方法：应用制式扩张器或自制简易扩张器进行术中即时扩张，用扩张出的“额外”皮肤修复各种创面。
Methods Using normal or self-made skin expander, intraoperative sustained skin expansion was done so as to gain "additional" tissue for covering wound surface.
方法：应用制式扩张器或自制简易扩张器进行术中即时扩张，用扩张出的“额外”皮肤修复各种创面。
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