求翻译：　　QQ提供了四个声音文件，分别是“客户消息”，是用来提示有好友或客户传来了消息；“系统消息”，用来提示有系统提供的消息，如果你设置了要验证才能将你加为好友的话，当有人要将你加为好友时，系统就会发出该声音提示你；“新上线”，用来提示有新朋友刚刚上线；“组”声音，在来设置组时提示用的。这四个文件都是WAV 文件，如果要修改它们，可按以下方法实现。是什么意思？

　　QQ provides has four a sound file, respectively is "customer message", is used to prompted has friends or customer came has message; "system message", used to prompted has system provides of message, if you set has to validation to will you plus for friends words, dang was to will you plus for fri