从管理上看，系统内管理的广告分三类：(1)目前在你的网站上正常播放的广告；(2)已满足限制条件(如开始设置的显示数已满，或者最后播放时间已到等)，被系统自动停止播放的失效广告；(3)由于其它原因，虽未失效，但被你人为停止播放的广告。-From a management point of view, the system management of advertising into three categories: (1) present in the normal play on your website advertising　(2) have been met constraints (such as the start to set the number of full display, or the last play time has to, etc.), by the system automatically stops playback failure advertising　(3) due to other reasons, although not fail, but you are artificially stop playing ads.