stiff clay 硬黏土 ; 韧粘土
stiff fissured clay 硬裂纹粘土 ; 硬裂隙黏土
The clay is very stiff 这粘土非常稠
stiff blue clay 硬青粘土
stiff f clay 硬粘土
the 1st stiff clay layer 第一硬土层
When the tunnel is driven through stiff clay, the flow of water may be small enough to be removed by pumping.
当隧道穿越粘稠土质时，水的流量也许会小到用水泵就可以抽干。
Then, with the withering of dry and cold climate, there appeared stiff clay sediment in the delta of the Changjiang River.
随着干冷气候的减弱，长江三角洲一带出现硬粘土沉积。
The clay is very stiff; we must make it thinner with water.
这粘土非常稠， 我们须用水使它变得稀一些。
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