单词：suetlike
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In the front of its lower jaw there are eight sharp teeth for nipping. There are no teeth in its upper jaw opposite these, but there is a hard pad instead. At the back of its mouth the sheep has six teeth with flat tops on each side of each jaw. Thes
发表于:2019-02-07 / 阅读(108) / 评论(0)
英国学生科学读本
英国学生科学读本