移民官仍然得打开电子护照，阅读护照内容，然后用光感读码器刷条形码把持照人的档案读到显示器上，准备提几个问题。
The immigration officer still has to open the e-passport, read its contents and then swipe its bar-code through an optical reader to get the bearer's file up on a screen ready to ask a few questions.
读码头进行二维读码，解码，向控制层传输确切的X和Y轴位置信息。
The head reads the codes two-dimensionally, decodes them and transmits the exact X and Y position to the higher-level control.
提出了一种采用单读码器件的串行编码绝对式光学编码器，介绍了其工作原理和基本结构。
The presented absolute optical encoder is based on a serial encoding method with single code detector. Its working principle and structure is described.
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