论文部分内容阅读
非洲丹吉尔山区有一种老鼠,它们只有两只脚,身体圆滚滚的,皮毛浓而黑。它们不会爬行,只能跳跃前进,但是速度很快。它们集
There is a rat in the mountainous region of Tangier in Africa. They have only two legs. They are full-bodied with thick, dark fur. They do not crawl, they only jump forward, but they are fast. They set