联合国早在1982年就有远见地召开了“老龄化问题世界大会”，但后来还是不了了之。
The UN had the foresight to convene a "world assembly on ageing" back in 1982, but that came and went.
但是动物能预见地震的说法已经在科学界占有一席之地，所以世界各地的科学家都在试图对其进行研究，虽然研究结果各有不同。
But the theory of animals' sensing earthquakes has gained enough ground that scientists around the world have attempted to test it, with mixed results.
12亿左右的人口，约占世界人口的五分之一，生活在缺水地区(见地图)。
Some 1.2 billion people, about a fifth of the world's population, live in places that are short of water (see map).
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