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 电脑系统和外界设备的通讯; 双方告知对方资料已准备就绪可以被转让，以及接受方也已准备就绪可以接收[计算机]
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