硅谷不但产生了像谷歌这样在广告费用方面强劲的对手，甚至还出现了费用免费的竞争者，如Craislist，后者彻底打乱了分类广告行业。
It has also created free competitors, such as Craigslist, which has thoroughly disrupted the classified-advertising business.
硅谷不但产生了像谷歌这样在广告费用方面强劲的对手，甚至还出现了费用免费的竞争者，如Craislist，后者彻底打乱了分类广告行业。
It has also created free competitors, such as Craigslist, which has thoroughly disrupted the classified-advertising business.
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