Building top-down paragraph in introduction

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FENJUAN HU on Aug 22, 2018
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In Leonie Mueck's video, build a paragraph, she mentioned top-down and bottom-up paragraph. In introduction paragraph, bottom up seems more natural. But this usually distracts my attention while I need to read through whole lot of backgroup to get into the main point. Do you have any good examples of a top-down paragraph introduction section?