abrupt tone的用法和樣例：
例句
- As for rhymes, the ancient tone IV characters have all lost their stop codas and become empty-coda or vowel-final rhymes.
在韻母方面，古入聲字已全部失去塞音韻尾，變為開尾或母音尾韻母。 - There are no obvious relationship between weakening of the glottal stop and the length of the tone.
喉塞尾弱化程度與入聲時長無明顯關係。
