Simon Dale and his father-in-law dug into the side of a hill and then used the mud and stone to make the walls.
西蒙·戴尔和他的岳父在山坡上挖了个洞，然后用泥土和石头砌了堵墙。
Traditional houses are built of stone and mud, but straw is far more resilient, says California engineer Darcey Donovan, and warmer in winter to boot.
传统房屋的建筑材料是石头和泥土，但稻草更富有弹性，在冬季更能保暖，加利福尼亚州的工程师达西·多诺万如是说。
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。
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