如何发音
How to Make the Sounds
For [p], have your two lips touching, like in [b], except make it voiceless. For [f], put your
top teeth onto your bottom lip, and make a sound exactly like [v] except voiceless.
发[p]这个音，用双唇发音，类似[b]，只是不振动声带。发[f]，要用上齿咬住下唇，发出类似[v]的音，同样也不振动声带。
