科研之友
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<正>The world’s population has reached 8 billion people on November 15,representing a “milestone in human development” before birth rates start to slow,according to a projection from the United Nations.In a statement, the UN said the figure meant 1 billion people had been added to the global population in just 12 years.“This unprecedented growth is due to the gradual increase in human lifespan owing to improvements in public health,
