互通 meaning in English

interflow

He then corresponded and swapped duplicate with them .
那时他和那些人互通信件，互相交换复制品。
He now corresponded with them and swamped duplicates .
现在他和那些人互通信件，互相交换复制品。
Operators working in the exchange made all the connections between callers by hand .
互通电话人之间的接线工作全部由电话局里的话务员操作。
Design of collector - distributor lane for interchange
互通式立交中集散车道的设置
Water drainage system design at taiping interchange
太平互通式立交排水系统设计

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