1、 These episodes of rapid evolution are separated by relatively long static spans during which a species may hardly change at all.
这些快速进化的阶段被相对较长的静态跨度分隔开来，在此期间，一个物种几乎不会发生任何变化。
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2、 The world's largest existing marine reserve, established last year by the British government in the Indian Ocean, spans 554,000 km2 and is a no take zone throughout.
去年，英国政府在印度洋建立了世界上现存最大的海洋保护区，跨越55.4万平方公里，整个保护区均是禁渔区。
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