It's in solution, it's refrigerated, and it's very difficult to transport refrigerated vaccines to all the remote parts of the world where you would like to transport them.
疫苗需要溶解在水中,还要冷藏,而将这些冷藏的疫苗运送到,世界上所有的偏远地区是十分困难的
耶鲁公开课 - 生物医学工程探索课程节选
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