More infants are being immunized than ever before, according to a joint report by UN agencies and the World Bank. But experts say much more needs to be done to protect the world's poorest children from needless suffering. Vidushi Sinha | Washington 2

发表于:2018-12-08 / 阅读(49) / 评论(0) 分类 VOA标准英语2009年(十二月)

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发表于:2019-01-22 / 阅读(50) / 评论(0) 分类 NPR边听边练