sound change的用法和樣例：
例句
- My harp is tuned to mourning, and my flute to the sound of wailing.
所以，我的琴音變為悲音，我的簫聲變為哭聲。 - In modern chinese phonetics, tone sandhi of reduplicated adjectives, which is due to the influence of Beijing dialect, is often taught as an important sound change pattern.
摘要在現代漢語語音教學中，疊音形容詞變調常作為一條重要的音變規律提出。
