confluence
noun [ C ] geography specialized uk/ˈkɒn.fluː.əns/ us/ˈkɑːn.fluː.əns/
（河流）汇合处，汇流点，交汇处
the place where two rivers flow together and become one larger river
汇集，集合
a situation in which two things join or come together
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。
A confluence of events is pushing nuclear policy into the national spotlight. 一系列事件促使核政策成为公众关注的焦点。