https://www.rapbull.net/posts/429/%e9%97%9c%e6%96%bc%e6%99%ae%e9%80%9a%e8%a9%b1%e6%95%99%e5%ad%b8%e7%9a%84%e5%b9%be%e5%80%8b%e5%95%8f%e9%a1%8c/
關於普通話教學的幾個問題