搜索引擎营销又主要分为两种：搜索引擎优化（SEO）和付费点击（PPC，Pay-Per-Click）。搜索引擎优化（SEO）指通过优化网站和页面并让它们在搜索结果的页面中展示，而付费点.
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实际上，你可以用付费点击广告测试所有的东西。从产品的品种和价格，到广告标题和广告辞。
In fact, you can use PPC to test everything from your product offerings and price points to your AD headlines and sales copy.
主要零售网站和旅游机构的付费点击分别下降了20%和25%。
Paid clicks to major retail sites and travel agencies were down 20% and 25% respectively.
翰和菲舍尔拒绝说出多少钱，使他们从付费点击广告。
Goldberger and Fischer declined to say how much money they make from pay-per-click advertising.
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