articulation

他的演讲因对关键点的清晰阐述而受到赞扬。

His speech was praised for the clear ___articulation of key points.

她在演讲比赛中的清晰表达赢得了评委的赞赏。

Her clear ___articulation during the speech contest impressed the judges.

老师教学生们如何改善元音的发音。

The teacher taught the students how to improve their ___articulation of vowels.