The ringback tones business didn \'t gain popularity until two years ago in America .

美国的彩铃业务直到两年前才开始流行起来。

Subscriberers now tend to choose celebrity remarks as their ringback tones .

现在的彩铃用户比较喜欢选择名人的话语作为自己的彩铃。

Combined ringtone and ringback tone sales have fallen almost23 percent so far this year , according to Nielsen RingScan .

尼尔森公司对手机铃声专题调查显示，到目前为止，今年来电铃声和回叫铃声的销售量下降了将近23%。

The ringback tones are usually the peak part of a song , lasting just15 seconds gor fear of bringing heavy burden to communication network .

彩铃一般都悬挂用歌曲的高潮部分，通常都控制在15秒内，以免给通信网络带来过重的负担。

A ringback tone is an audible indication that is heard on the telephone line by the caller while the phone they called is still in use .

“接通回音”指电话处于正常使用状态时，打电话的人从听筒中听到的声音提示。