enunciate
/ɪˈnʌnsɪeɪt; ɪ`nʌnsɪˌet/ v
1 [I, Tn] say or pronounce (words or sounds) clearly （清晰地）念（字）, 发（音）
That actor enunciates very well. 那演员发音很清晰.
She enunciated each word slowly for her students. 她把每个字都给学生慢慢念清楚.
2 [Tn] express(a theory, etc) clearly or distinctly 阐明（理论等）
He is always willing to enunciate his opinions on the subject of politics. 他总是愿意对政治问题发表意见.