Pyaudio不能被Python识别，怎么办？

Could not import the PyAudio C module '_portaudio'.
Traceback (most recent call last):
  File "C:\Python39\lib\site-packages\speech_recognition\__init__.py", line 108, in get_pyaudio
    import pyaudio
  File "C:\Python39\lib\site-packages\pyaudio.py", line 116, in <module>
    import _portaudio as pa
ModuleNotFoundError: No module named '_portaudio'
在处理上述异常的过程中，发生了另一个异常。
Traceback (most recent call last):
  File "C:\Python39\yagmail.py", line 2, in <module>
    import yagmail
  File "C:\Python39\yagmail.py", line 5, in <module>
    with sr.Microphone() as source:
  File "C:\Python39\lib\site-packages\speech_recognition\__init__.py", line 79, in __init__
    self.pyaudio_module = self.get_pyaudio()
  File "C:\Python39\lib\site-packages\speech_recognition\__init__.py", line 110, in get_pyaudio
    raise AttributeError("Could not find PyAudio; check installation")
AttributeError: Could not find PyAudio; check installation
我已经安装了Pyaudio至少十几次了，但它不工作，我的笔记本是windows 10 64位，但为什么端口音频出现在错误中，我的意思是portaudio与mac有关，对吗？为什么它会问到portaudio？还有，我已经安装和卸载了pyaudio至少十几次了。我用pip、pipwin什么的来安装它。而且不只是这个yagmail项目，语音识别和pyaudio相关的每个项目都显示同样的错误。