“乡音的”可以翻译为“of the local accent” 或者 “pertaining to one's native dialect” ,具体使用哪个表达取决于上下文语境。
“of the local accent” 强调与地方口音相关,比如:The charm of that song lies in the use of words of the local accent.(这首歌的魅力在于使用了具有地方口音特色的词汇 。)
“pertaining to one's native dialect” 更侧重于与某人本地方言相关,例如:He has a deep affection for everything pertaining to his native dialect.(他对与本地方言相关的一切都有着深厚的感情 。)