coping stone
... coparcener 共同继承人 coping 盖顶〔墙或栏〕；墙帽；栏顶 coping stone 盖顶石；墩台石 ...
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人们用拱顶石来盖顶，或者把雪块削切得上边缘比下边缘更宽，放进剩下的屋顶缺口里，再用雪来塞满雪块间的缝隙。
They cap the igloo by dropping a keystone, or block with edges cut wider above than below, into the remaining gap in the roof, and "grout" the gaps between blocks of snow with additional snow.
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