HSK 7-9
流畅
liúchàng形
flowing (of speech, writing); fluent; smooth and easy
她的中文表达自然又流畅。
Tā de zhōngwén biǎodá zìrán yòu liúchàng.
Her spoken Chinese is natural and fluent.
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Appears across levels (7-9) in the HSK 3.0 word list.