以下为句子列表：
英文: Andwhile most couples are thrilled with their long-awaited bundles of joy,more babies often means more complications, such as low birth weight,premature delivery, and greater risk of infant mortality orcomplications.
中文: 当多数夫妇因之而兴奋时,然而更多的婴儿经常意味着更多并发症,譬如低产重,早产,和高死亡率和并发症风险。
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英文: In ancient times infant mortality was extremely high.
中文: 在古代婴儿死亡率极高。
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英文: Infant mortality (ie The rate at which babies die) was 20 deaths per thousand live births in 1986.
中文: 1986年的婴儿死亡率为生育成活率的千分之二十.
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英文: Infant mortality headed into a steep dive.
中文: 婴儿死亡率开始急剧下降。
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英文: Infant mortality is still very high in some countries.
中文: 婴儿死亡人数在一些国家仍然很高。
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