What researchers such as Ransom Myers and Boris Worm have shown is just how fast things are changing.
【析句】这句子中，what引导主语从句，is是谓语，how引导的从句做宾语。
That means a higher proportion of what is in the sea is being caught, so the real difference between present and past is likely to be worse than the one recorded by changes in catch sizes.
【析句】这是一个因果关系的复杂句，what引导的从句修饰propotion。
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