53.there is no scanning line is into reverse.

开机后开始没有扫描线。

55.the scanning line reverses , pauses, skips.

扫描线反转，停顿，跳跃。

46.there is sometimes no scanning line on radar screen

雷达屏幕上有时没有扫描线。

54.the rotation of scanning line is into reverse.

扫描线反转。

52. the rotation of scanning line is not in even speed

扫描线转动不均匀。

57.there is no echo signal. But brightness, scanning line are still exists.

没有回波，但亮度，扫描均正常。

He has never heard me scan a line'.

他从未听过我扫过一行” 。

The other option is to repeatedly follow a fixed path, scanning line by line, from top left to bottom right, and looping over and over again.

另一种选择是重复按照固定路径，逐行扫描，从左上到右下，一遍又一遍地循环。