由两个或两个以上的同构成复合词时，其下位词的第一个假名（音节）常发生音韵变化现象。例如：[haru]＋[saiku]→[takezaiku]（竹细工）[barn]＋[ame]→[barusame]（春雨）我们知道，日语中没有这个单词，只有由于的前面有了这一上位词，故使下位词的第一个音节由清音变成浊音 When two or more same words form a compound word, the phonological variation often occurs in the first pseudonym (syllable) of the hyponyms. For example: [haru] + [saiku] → [takezaiku] [barn] + [ame] → [barusame] (spring rain) We know that there is no such word in Japanese, Therefore, the first syllable of the hyponyms becomes unvoiced