破碎的石头、人工制造的轻质石头和海贝，经常用来代替墙上的砾石。
Crushed stone, manufactured lightweight stone, and seashells are often used in lieu of mural gravel.
最简单的石料加工品是粗石，在研磨机中粗略地破碎的石头。方石加工品是由整齐地切割出具方形边缘之石块所组成。
The simplest stonework is rubble, roughly broken stones bound in mortar. ashlar work consists of regularly cut blocks with squared edges.
最简单的石料加工品是粗石，在研磨机中粗略地破碎的石头。方石加工品是由整齐地切割出具方形边缘之石块所组成。
The simplest stonework is rubble roughly broken stones bound in mortar. ashlar work consists of regularly cut blocks with squared edges.
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