largest and most biodiverse tract
definitions
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A continuous area of land that is both the greatest in size and contains the highest variety of living species.zh: 面积最大且物种最丰富的区域
examples
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The Amazon basin represents the largest and most biodiverse tract of rainforest on Earth.
亚马逊盆地代表了地球上面积最大且物种最丰富的热带雨林区域。