protective coal seam
英
美
- 保护层
双语例句
- The glass window had a protective overcoat applied to it.
玻璃窗涂有一层保护层。 - All buried lines are coated with a protective covering to save them from corrosion.
所有埋设的管道必须涂上保护层，以防生锈腐蚀。
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