Zhè / běn / yǔ / yán / xué / jiào / cái / zhuān / mén / jiè / shào / le / bì / kǒu / yùn / de / lì / shǐ

这本语言学教材专门介绍了闭口韵的历史。

This linguistics textbook gives a detailed introduction to the history of closed-mouth finals.