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词汇 protective coal seam
释义 protective coal seam
基本例句
保护层
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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