My Apple phone asks siri about the weather forecast. Why didn't it answer?

The network is not connected, or Mandarin is not standard when speaking, or voice commands cannot be received. Apple mobile phone reconnects to the network or needs to clean the microphone of Apple mobile phone to prevent the microphone from being blocked by dust or foreign objects, otherwise Apple mobile phone will not be able to receive voice commands. When calling siri, we should also pay attention to the standard of voice and the accuracy of pronunciation, preferably near the microphone of Apple's mobile phone.