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15. What researchers such as Ransom Myers and Boris Worm have shown is just how fast things are changing. 【分析】复合句。本句中 what 引导主语从句，其中 such as Ransom Myers and Boris Worm 表列举，is 是系动词。 【译文】

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15. What researchers such as Ransom Myers and Boris Worm have shown is just how fast things are changing. 【分析】复合句。本句中what引导主语从句，其中such as Ransom Myers and Boris Worm 表列举；is是系动词，how引辱的从句

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