They are made of mud, in some cases reinforced by stone.
基本都是用泥土筑成，还有一些用石块进行了加固。
Let me see if the hillocks are made of stone of mud.
这山丘是石山呢，还是泥山呢？
The preparation of red cement using activated red mud stone has been studied.
介绍利用活化红泥岩制备红色水泥的研究。
The preparation of red cement using activated red mud stone has been studied.
介绍利用活化红泥岩制备红色水泥的研究。
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