(每日一词）confluence

Confluence  /ˈkɑːn.fluː.əns/ n. （河流）汇合处，汇流点，交汇处

meaning: a situation in which two thing join or come together 

前缀: con- 全部，共同，所有

词根：flu- 流动

后缀：-ence 名词后缀

e.g. The change has been brought on by a confluence of factors. 这种变化是由多种原因共同促成的。