dead square cut 精确裁切
More than 400 dead zones with a total area of 245, 000 square kilometers were identified worldwide last year.
去年全世界共确认400多死亡区，总面积达245000平方千米。
Scientists say ocean dead zones, which vary in size from one square kilometre to 70, 000 square kilometres, have been found all over the world.
科学家们说已在世界各地发现，从一平方公里到七万平方公里大小不等的海洋死区。
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