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usually has a shell
通常有一个壳
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Scab. An imperfection in the form of a shell or veneer, generally attached to the surface by sound metal. It usually has its origin in an ingot defect.
结疤。通常由钢锭缺陷引起的、附着在完好金属表面上的薄壳状或镶片状缺欠。
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