Many economists, sociologists, demologists have made broad discussion and research on this problem for a long time.
英
美
- 长期以来，经济学家、社会学家、人口学家都对这一问题进行了广泛的探讨与研究。
- 今日热词
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- 深远海浮式风电平台 - deep-sea floating wind power platform
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- 京雄高速公路 - Beijing-Xiongan expressway
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- 农业及相关产业增加值 - the added value of agriculture and related industries
