voluble [ˈvɒljʊbl]

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adj.流畅的（旋转性的）

speaking a lot, with confidence and enthusiasm

Evelyn was very voluble on the subject of women's rights.伊夫林谈起女权这个话题口若悬河。
He became very voluble and told her everything.他变得滔滔不绝，把一切都告诉了她。