含义：流动
拉丁语 'fluere'，意为'流动'，源自原始印欧语 'dheu-'，意为'流'或'滴'。
波动，起伏
"The stock prices fluctuate daily."
流利，流畅性
"His fluency in English is impressive."
流畅的，能说会道的
"She speaks fluent French."
水槽，引水渠
"The flume carried water from the mountain to the town."