当蝗虫群被发现时，科学家会用铲子弄来一些虫子，然后在它们的背面贴上反射镜。
When a swarm is detected, the scientists will scoop up a few dozen insects and glue little reflectors on their backs.
反射镜的背面应经常与空气接触但无需通风。
The reverse side of the mirror should be in continuous contact with air without needing ventilation.
反射镜的背面应经常与空气接触但无需通风。
The reverse side of the mirror should be in continuous contact with air without needing ventilation .
拍摄亮物时，影象周围现出的一种晕 圈，它是由底片背面的反射光形成的。
In photography, a halo around bright highlight areas caused by light reflected from the back of the negative.
拍摄亮物时，影象周围现出的一种晕 圈，它是由底片背面的反射光形成的。
In photography, a halo around bright highlight areas caused by light reflected from the back of the negative.
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