Apple拒绝UIBackgroundmodes？

Question

My App has been rejected by apple for the below reason

     Performance - 2.5.4 Your app declares support for audio in the UIBackgroundModes key in your Info.plist but did not include features
 that

在后台，我们的应用程序必须支持，以便我在info.plist中添加密钥

如果我删除该键意味着音频无法在后台模式播放。那么怎么可能..？