每条线段的端点 都赋以四位二进制码,称为区域码(region code),用来标识出端点 相对于剪取矩形边界的位置。区域通过如下所示的边界设定。
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你要把二维码置于这个区域的中心,让“条形码阅读器”能够读取。
You'll want to center the QR code inside that display so that it can be read by Barcode Scanner.
在接收端,当你的手机收到一条来自Gmail的短消息时,这个号码会显示来自406号码区域。
On the receiving end, when you get a text message from Gmail on your phone, it will come from a number in the 406 area code.
类似于同步信号的是“临界区域”,它是程序码中不可中断的部分。
Similar to semaphores are "critical sections," which are sections of code that cannot be interrupted.
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