永久型封隔器由容易钻掉或者磨铣掉的材料制成。

Permanent packers are constructed of materials that are easy to drill or mill out.

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玉琮的抛光工艺上，磨垅光洁而不留据、钻、凿、磋的痕迹，使得器形浑圆规整。

Tsung-yu of the polishing process, the mill rather than to stay bright and clean, according to Long, drilling, cutting, traces of polish, making regular rounded shape.

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