以下为句子列表：
英文: A large and rapid drop in the world's birth rate has taken place during the past 10 years.
中文: 世界人口的出生率在过去10年里发生大幅快速的下降。
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英文: Birth rate was up 2.5 times in those years.
中文: 那些年出生率上升了2.5倍。（小数2.5在句中作修饰语。）
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英文: Demographers say that no country's birth rate has ever recovered after dropping below 1.5, so governments need to do everything they can to avoid falling into a headlong decline.
中文: 人口统计学家们说，没有一个国家的生育率曾在低于1.5之后恢复过元气，所以政府需要不遗余力，以便避免落入一路下滑的趋势。
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英文: Furthermore, the birth rate has been put under control.
中文: 其次，国民经济正在迅速发展，而且出生率已经得到控制。
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英文: In 1960 the death rate soared to 68 percent from its normal level at around 15 percent, while the birth rate fell to 11 percent from its previous average of 30 percent.
中文: 1960年，死亡率已经从平常水平的15%左右飞升到68%，而与此同时出生率由先前大约30%降为11%。
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