屋顶覆盖层；屋面材料
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屋顶覆盖层；屋面材料；屋顶覆盖层；屋面材料
a material or layer that covers a roof
The old roof covering was replaced with modern tiles.
旧的屋顶覆盖层被换成了现代瓦片。
屋顶覆盖层；屋面材料
a material or layer that covers a roof
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