fluency

Mary is ambitious enough to aspire to conversational fluency in Chinese in four months.

玛丽雄心很大，竟想在四个月里学会用汉语流利地会话。

I have achieved varying degrees of fluency in 12 languages, and look forward to learning more.

我已经在12门语言上达到了不同程度的流利，还期待学更多种语言。