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发表于:2018-12-01 / 阅读(159) / 评论(0) 分类 用Mp3背六级单词

One of the goals of regenerative medicine is to make tissue to replace our own damaged body parts. Thats still a ways off. But starting with mouse embryonic stem cells, researchers have succeeded in creating heart muscle that actually beats. The stud

发表于:2019-01-08 / 阅读(164) / 评论(0) 分类 Scientific American(十)月

发表于:2019-02-25 / 阅读(172) / 评论(0) 分类 考研英语