vocal: implies ready responsiveness to an occasion for expression or free, forceful, insistent and emphatic voicing of one's ideas and feelings : one of the Pres's most ~ critics.


articulate: implies the use of language which exactly and distinctly reveals or conveys what one seeks to express: questioned the validity of the criticism from a critic who is himself hardly ~.


fluent: stresses facility in speaking and writing and copiousness in the flow of words: seemed ~ on any subject; or facility and ease in the use of a foreign lang: had a ~ command of idiomatic French.


eloquent: usually implies fluency, but also suggests the stimulation of strong emotion and use of fervent and moving language: moved by the ~ words of the Gettysburg address .


voluble: is somewhat derogatOry and may suggest a flow of language difficult to stem: indulge in ~ explanations.


glib: is also derogatOry and may imply an emptiness and superficiality in what is said, or untrustworthiness and slipperiness in the speaker:  例1: a ~ reply; 例2: known for his ~ tongue.


vocal发声的: 积极表达有力发声，articulate准确: 语言准确清楚表达想表达的意思，fluent流利: 强调轻松(facility)和健谈(copious大量), 或外语轻松容易，eloquent雄辩: 热情动人语言, 激发激情，voluble喋喋不休: 贬义, 一串话难以断句，glib油嘴滑舌: 同样贬义, 语言空洞肤浅, 说话人油滑不可信。


记忆方法：1）fluency基本词是facility。而eloquent基本词是fluency.

         2） 首字母联想记忆：VAFE VG
         妻子很高兴Wife(Vafe) Very Glad--> 变得很健谈

          VG是贬义，其余褒义或中性。

         3）健谈的意思是能清晰轻松地表达自己mean being able to express oneself clearly and easily.