a.

1. 流利的，流暢的[（+in）]
   She writes fluent French.

   她寫的法文很流暢。

2. （河水等）暢流的；液態的

adj.

1. speaking or writing easily and accurately, especially in a foreign language.
   ▸(of a language) used easily and accurately.
2. smoothly graceful and easy.
3. able to flow freely; fluid.