慢速英语:世界人口可能在本世纪中叶后减少

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profound - adj. deep, dramatic

author - n. one who writes an essay, book or article

gross domestic product - n. the total value of goods produced and services provided in a country during one year.Compare with

geopolitical - adj. relating to politics, especially international relations, as influenced by geographical factors.

decline - n. a decrease or lessening