浏览器通过调用预先注册的函数来传递事件。
Browsers pass events by calling functions that were registered in advance.
年会摊位，同时预先注册。
Visit next year's convention booth, and register in advance.
预先注册的用户通过扫描ATM屏幕上的QR码，与移动设备连接。
The preregistered user integrates the mobile device by scanning a QR code on the ATM screen.
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