Surface preparation of metal before chemical process. Removal of a layer of the base metal.
在化学处理之前的表面准备，移除一层金属基材。
There was a layer of silver leaf outside the metal.
金属外边有一层银薄膜。
The metal layer (4) is made by metal which murray rigidity is less than 3.
金属层（4）由莫氏硬度为3以下的金属形成。
The metal layer (4) is made by metal which murray rigidity is less than 3.
金属层（4）由莫氏硬度为3以下的金属形成。
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