hand shaking
柯林斯词典
1. N communication between a computer system and an external device, by which each tells the other that data is ready to be transferred, and that the receiver is ready to accept it 電腦系統和外界設備的通訊; 雙方告知對方資料已準備就緒可以被轉讓，以及接受方也已準備就緒可以接收[計算機]
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