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1·He had to carry water and dig up the red earth and mix it into a stiff clay.

他要取水挖掘红泥，并把它混成稠密的粘土。

2·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。

3·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。

4·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。

5·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。