"With reform, we will make our financial system more transparent by bringing the kinds of complex backroom deals that helped trigger this crisis into the light of day."

VOA: standard.2010.05.15

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。

麻省理工公开课 - 固态化学导论课程节选

A sodium chloride crystal is transparent to visible light.

氯化钠晶体对可见光透明。

麻省理工公开课 - 固态化学导论课程节选

Why is it transparent to visible light?

为什么对可见光透明呢？

麻省理工公开课 - 固态化学导论课程节选