医生、牙医和化学家们开发出的牙粉中含有研磨牙齿的物质，如砖灰、碎瓷器、陶器和乌贼。
These powders were developed by doctors, dentists and chemists and included substances very abrasive to teeth, such as brick dust, crushed China, earthenware and cuttlefish.
亭由灰砖砌成，砌在原先的烽火台上。
The pavilion was made by grey bricks and was settled up on the old beacon tower.
西关老屋的外表由灰砖组成。
The facade of a Xi Guan house was generally built with grey bricks.
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