在《汉语拼音方案》(以下称“方案”)的教学中,隔音问题是一个重要问题。汉语开、齐、合、撮四类韵母在自成音节的情况下都存在隔音问题,它们分别用两种方法隔音:一是开口呼韵母自成音节跟在其他音节后面构成双音节或多音节词语时用隔音符号隔音;二是齐齿呼、合口呼、撮口呼韵 In the teaching of the “Language Pinyin Scheme” (hereinafter referred to as the “Project”), sound insulation is an important issue. Chinese rhymes such as Kai, Qi, He, and Xun have sound insulation problems in the case of self-syllable syllables. They are insulated in two ways: First, the self-made syllables of the opening and closing vowels follow the other syllables to form a double syllable or a polysyllable. Words are soundproofed with soundproof symbols; secondly, they are called by tooth, mouth, and mouth.