VOA慢速英语2012.08.04 的, including, research, countries, 早产

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The research team found that fifteen countries -- including the United States and Brazil -- had two-thirds of all preterm births. Sixty percent of preterm births happen in South Asia and sub-Saharan Africa.该研究小组发现包括美国和巴西在内的15个国家占到了早产数量的2/3。60%的早产发生在南亚和撒哈拉以南非洲地区。
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