“口若悬河”，汉语成语，意为说话滔滔不绝，像河水倾泄一样。形容能说善辩，话语不断。可以翻译为“speak volubly，talk glibly或be eloquent”。

例句：

伊夫林谈起女权这个话题口若悬河。

Evelyn was very voluble on the subject of women's rights.