An Afghan brick worker shows his dirty feet, after using them to mix the clay on November 6th, 2009 in Kabul, Afghanistan.

2009年11月6日，阿富汗喀布尔。一名砖厂工人搅拌粘土后沾满泥土的双脚。

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In the engineering construction in traditional technology of clay brick wall is one of main material form, and, to some extent, waste of land resources.

在工程建筑的传统工艺中粘土砖是墙体构成的主要材料之一，在一定程度上浪费了土地资源。

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Others shall control or prohibit the production and use of solid clay brick by stages and groups according to the state plan.

其他地区应当按照国家的规划，分期分批限制或者禁止生产、使用实心粘土砖。

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They have also supported related areas of labor, contracting out clay mining in the surrounding area, hauling and trucking 10-20 loads of clay and brick per day, and bringing in contractors for large maintenance projects.

WHITEHOUSE: Laying the Foundation for Economic Success, Brick by Brick

The loose surface and different clay characteristics meant the crushed-brick surface required a different game plan, he said.

CNN: Tennis interactive: Why clay is so different

The crushed-brick mixture that constitutes the base of a clay court produces a the highest bounce and most friction of the three surfaces, meaning they have the lowest CPR of all three surface types and are considered as the "slowest".

CNN: Tennis interactive: Why clay is so different