名词
中文翻译：出生率
同义词：
['population growth rate', 'fertility rate']
例句：
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1. The birth ratein this area has been declining for several years.
这个地区的出生率已经下降了几年。
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2. The government is trying to increase the birth rate to combat population aging.
政府正试图提高出生率以应对人口老龄化。
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3. The researchers found that a higher birth rate was associated with lower infant mortality rates.
研究人员发现，出生率越高，婴儿死亡率越低。