英 ['fluːənt] 美 ['fluənt]
"the fluid motion of a cat"
"the liquid grace of a ballerina"
来自拉丁语fluere, 流动，来自PIE*bhel，膨胀，涌出，词源同boil. 在词源上该词与float等有所差别和侧重，但是词义上已经基本重合。
fluent: see flux
1580s, "flowing freely" (of water), also, of speakers, "able and nimble in the use of words," from Latin fluentem (nominative fluens) "lax, relaxed," figuratively "flowing, fluent," present participle of fluere "to flow, stream, run, melt," from extended form of PIE root *bhleu- "to swell, well up, overflow" (cognates: Latin flumen "river;" Greek phluein "to boil over, bubble up," phlein "to abound"), an extension of root *bhel- (2) "to blow, inflate, swell;" see bole. Used interchangeably with fluid (adj.) in 17c. in the sense "changeable, not rigid." Related: Fluently.
1. He is a fluent speaker of Hebrew.
2. She's fluent in French and German. She also speaks a little Italian.
3. She's fluent in Polish.
4. She speaks fluent and idiomatic English.
5. Long practice enabled that American to speak fluent Chinese.
fluent speaker 流利的演说者
fluent metal 液态金属
fluent aphasia phr. 流畅失语症；空洞型失语症
fluent granular solids 流化床粒状催化剂