当我做广告代理的时候，我们付出巨大努力去精心制作一些视觉导向的幻灯片和挂图介绍来卖掉我们的广告和营销概念。

When I ran an advertising agency, we put enormous efforts into making elaborate, visually oriented slide and flip-chart presentations to sell advertising and marketing concepts.

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例如，在幻灯片，我们比较的基础上的广告位置，每次访问所浏览的网页。

For example, in the slide, we're comparing ad positions based on pages viewed per visit.

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