An international group of astronauts, scientists and others have called for a rapid expansion of efforts to detect asteroids capable of causing widespread destruction on earth, warning that this is one of the biggest threats to humanity in the coming centuries.
一个由宇航员、科学家等人组成的国际团体呼吁尽快加大侦测力度，找出那些能够对地球造成大面积损害的小行星。该团体警告说，这是未来几百年内人类面临的最大威胁之一。
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