This is admittedly a tough comparison because the Beijing Olympics last year spurred heavy AD spending.

不可否认，与上年同期的比较本身就不合理，因为去年的北京奥运会刺激了大量广告开支。

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By comparison, Spotify's free version is AD supported, restricted to desktop usage and caps the number of song plays after six months.

相比之下，Spotify的免费版是有广告赞助的，仅限于电脑使用，而且六个月后可听歌曲的数量就会受到限制。

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For comparison purposes, a banner AD on the Web getting a 2% click-though rate (CTR) is considered fairly successful, but most campaigns now receive just 0.2%-0.3% CTRs.

要知道，如果网页上的banner广告点击率达到2%的话就会被视为非常成功，但大部分点击率只有0.2 - 0.3%。

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It can certainly be an uphill battle, with a user base that pales in comparison to the iOSes ad Androids of the world -- and then there's the fact that the OS hasn't actually launched in the States yet.

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For an apples-to-apples comparison of network programs of differing lengths, the series are ranked based on ad revenue per average 30 minutes.

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