station to station calling-operator assistance
... station to station calling(分机间呼叫) station to station calling-operator assistance(分机间呼叫–话务员协助) step call(步进呼叫) ...
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station to station calling-operator assistance
站对站呼叫接线员协助
以上为机器翻译结果,长、整句建议使用 人工翻译 。