扫描

1. 利用多次垂直扫描来重显一幅完整图象的扫描技术。电视中使用2：1的交错率，即每帧分两场，垂直扫描两次，一场扫描奇数行，另一场扫描偶数行。
   In scanning, the technique of using more than one vertical scan to reproduce a complete image. In television, 2:1 interlace is used, giving two vertical scans(fields) per frame; one field scans odd lines, and one field scans the even lines of the frame.
2. 在系统中等待处理的一组或一队列新信息，主调度程序对该队列及其它队列进行扫描，使之顺序进入处理状态。
   A queue of new messages(or a group) within a system that are awaiting processing. The main scheduling routine will scan them along with other queues and order them into processing in order.
3. 医生给他做了脑部超声波扫描检查。
   The doctors gave him an ultrasonic brain scan.

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描的英语翻译：