还有人尝试提供免费电话服务来回报听广告的用户。
There have even been attempts to offer free telephone services in return for listening to ads.
XCache是免费的开源软件，安装费时不多却可提供巨大回报。
XCache is free and open source software, takes little time to install and provides a substantial return.
这些网站都提供免费的网络服务，并由此聚拢人气，然后期望在将来的某个时候收获大笔的广告费回报。
Each provided a free service in order to attract a large audience that would then-at some unspecified point in the future-attract large amounts of advertising revenue.
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