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three-way calling

n. a way of adding a third party to your conversation without the assistance of a telephone operator

1、三线呼叫

... 三线三度重合(磁芯存储器)：TDTW Three Dimensional Three Wire 三线呼叫：three-way calling 三位组：triad ...

2、三路呼叫

...three-way valve 三路阀,三通阀...three-way calling 三路呼叫three-way tube [化] 三通管 ...

计算机科学技术

n.a way of adding a third party to your conversation without the assistance of a telephone operator

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