这是一篇关于制作污损的金属纹理的非常简单的，通用的教程。

Here is a very simple, generic tutorial I wrote up for a dirty metal texture.

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目的探讨负压闭式引流(VS)加一期内固定治疗开放性肢体骨折伴软组织污损的效果。

Objective To investigate the effect of vacuum sealing (VS) technique and emergency internal fixation on the management of limbs open fracture and soft tissue dirty defects.

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第二十条残缺、污损的人民币，按照中国人民银行的规定兑换，并由中国人民银行负责收回、销毁。

Article 20 the damaged or soiled Renminbi shall be exchanged in accordance with the regulations of the Peoples Bank of China, which shall also be responsible to recall and destroy such Renminbi.

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