By night camera, two people will open it to view the contents of record, I was surprised to find that the picture presented two significant visible parallel light beam.

通过彻夜的拍照，二人将它记录下的内容翻开查看，却惊奇地发现画面中呈现两道显着可见的平行光柱。

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We analyzed the stray light source of system and drew a conclusion that non-image beam has great effect on system qualities and system ghost images caused by parallel Windows should not be ignored.

分析了系统杂散光的来源，得出非成像光束对系统影响较大、平板玻璃窗产生的鬼像不容忽视的结论。

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The straight-edge diffraction of this parallel beam superposing on the light spot constitutes the so-called M-line.

这束平行光的直边衍射花纹与光斑本底叠加的结果在观察屏上形成为通常所称的M线。

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