dry hard clay 干硬粘土
cheese hard clay 硬乳酪状粘土
white-hard clay 白硬土
C hard clay 硬质陶土
hard clay grog 硬质粘土熟料
hard clay mine 硬质粘土矿
hard clay shell 硬壳层
first hard clay 第一硬质黏土层
The core is composed of the hard clay in the upper layer and the costal or shallow sea sediments(not drilled the bottom)in the lower layer.
该孔主要由上部的硬粘土和下部的滨(浅)海沉积(未见底)构成。
参考来源 - 苏州澄湖地区晚更新世沉积记录与环境变迁·2,447,543篇论文数据，部分数据来源于NoteExpress
Most tennis is played on hard courts, but a substantial amount is played on clay.
大多数网球是在硬地球场上打，但相当多的是在红土场地上打。
During the seventeenth and eighteenth centuries, the entire site became covered with a layer of hard grey clay, which minimised further erosion.
在十七世纪和十八世纪，整个遗址被一层坚硬的灰色粘土覆盖，这极大减少了进一步的侵蚀。
Next I formed a clay oven and made some other tools from hard wood and cloth to bake bread.
接下来我做了一个粘土烤炉，用硬木和布做了一些其他的工具来烤面包。
Henry Clay said the campaign was a struggle between log cabins and palaces, between hard cider and champagne.
VOA: special.2009.01.22
Clay becomes very hard when it is put in a fire or a special oven called a kiln.
VOA: special.2009.01.12
The kinds of minerals in clay affect how soft or hard it is to work with.
VOA: special.2009.09.09
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