AttributeError: 'Recognizer' 对象没有属性 'Listen'

如何解决AttributeError: 'Recognizer' 对象没有属性 'Listen'

语音识别在这里不起作用是我的代码：

robot_ear = speech_recognition.Recognizer()
with speech_recognition.Microphone() as mic:
   print ("Robot: I'm listening")
   audio = robot_ear.listen(mic)

you = robot_ear.recognize_google(audio)

print(you)

但计算机对我说的话没有反应：

Robot: I'm Listening
Traceback (most recent call last):
  File "E:\Python learn\code\nghe.py",line 7,in <module>
    audio = robot_ear.Listen(mic)
AttributeError: 'Recognizer' object has no attribute 'Listen'

请告诉我如何解决这个问题:((