"What is important for our friends and partners here in the Middle East to be assured of is that the United States will be very open and transparent about these contacts, and we will keep our friends informed of what is going on so that nobody gets surprised,".

VOA: standard.2009.05.05

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

And that team is continuing to gather that information." A U.S.advocacy group, Physicians for Human Rights, says that allowing Dostum to return to any position of power before there is a thorough and transparent investigation of allegations against him will been seen by Afghans as confirmation that warlords like Dostum have impunity for their crimes.

VOA: standard.2009.08.17

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