When you want to know if something is transparent to visible light or not, here is the mystery material and here is visible light.
而我们知道,物体是否对可见光透明,这里是神秘的材料,这里是可见光。
A sodium chloride crystal is transparent to visible light.
氯化钠晶体对可见光透明。
Why is it transparent to visible light?
为什么对可见光透明呢?
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