I heard their ads is by auction.

来源: 于 2012-06-04 10:16:47 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Was it because your ads got outbid? 

Or, your impression is too low?

It is not guaranteed that your ads will be showed even if your have the highest price, but low impression.

Gu-shi