Many of the discrepancies between what the public sees as healthy and how experts define it can be attributed to marketing.
between what the public sees as healthy and how experts define it 是介词短语做定语，那么between后面引导的是什么从句呢
between A and B 结构中，A和B都应该是名词性结构。这里的what从句和how从句都是名词性关系分句。名词性关系分句本质上相当于一个名词词组，what=the thing which. How=the way in which. 因此，between A and B 在这里其实还是后接了二个名词词组。
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