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But by far our most serious problem is a declining and aging population.
但是到目前为止，我们最严重的社会问题是人口下降问题和老龄化的问题。
youdao
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But the tiger population is still declining.
但是老虎的数量仍然在下降。
youdao
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The population rate of increase is declining.
人口增长率正在下降。
youdao
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The population rate of increase is declining.
人口增长率正在下降。
youdao