黏土摸起来像油灰时，就可以用了。When the clay feels like putty, it is ready to use.黏土和砂岩都是不牢固的岩石构造。Both clay and sandstone are unstable rock formations.在那儿她开始用黏土做模型。There she began to model in clay....

“黏土”的英语可以翻译为：all clay ...