Obama had trouble winning working class support in his primary battles with former rival Hillary Clinton, but pollster Clay Richards says he appears to be making some inroads.

奥巴马与前竞争对手希拉里·克林顿进行初选之战时，他很难获得工薪阶层的支持，但民意测验专家Clay Richards说，奥巴马在这方面已经有所改善。

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The roof of the Primary School was pulled away from the learning space of the interior though, and a perforated clay ceiling with ample ventilation was introduced.

小学的屋顶远离内部的学习空间，通过多孔粘土天花板来为屋顶提供足够的通风。

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Stone and clay were the primary masonry materials in the Middle Ages and later.

石头与黏土是中世纪和后来主要的砖石工艺材料。

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The project intends to use a proprietary process employing an in-duct scrubber to reclaim the alkaline clay produced as the primary by-product of the aluminum manufacturing process.

FORBES: Alcoa Could Clean Up With Carbon Capture