The defining challenge of the 21st century will be to face the reality that humanity shares a common fate on a crowded planet.
确定21世纪的挑战就必须得面对一个现实：人类在这个拥挤的星球上拥有一个共同的命运。
The defining challenge of the 21st century will be to face the reality that humanity shares a common fate on a crowded planet.
确定21世纪的挑战就必须得面对一个现实：人类在这个拥挤的星球上拥有一个共同的命运。
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