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

you gonna be transparent and explainning to people what you need done, because no one can understand completely what you are, as the surgeon, thinking.

同时还需要公正公平地,向周围的人们解释你希望做些什么，因为你的队友并不能,一开始就完全地明白，你作为外科医生时的想法。

普林斯顿公开课 - 领导能力简介课程节选

That is how you determine if something is transparent.

这就是决定某个物体是否透明的关键所在。

麻省理工公开课 - 固态化学导论课程节选

You have a tube, a transparent--a tube--a hollow tube, and at the top of the tube you throw a ball through so it whips through the tube and it comes out.

用一根管子,一根透明中空的管子,从管子最上面,你丢进去一个小球,小球迅速穿过管子,飞出来

耶鲁公开课 - 心理学导论课程节选

I actually want to change that around, if I might, and play with that, because that's a really useful image for us: "takes the mask off literature and reminds us how we come to be sympathetic or Richard Wright how we come to think something." Think back to Richard Wright, who wants words to disappear, to be completely transparent and to leave you just with your response.

实际上，我想要改变一点，可能的话，玩弄一下，因为那对我们是很有用的画面：,把文学的面具卸下,我们是如何同情,或思考事物的，回想一下，他希望文字消失，而变成透明的，只剩下你们的回应。

耶鲁公开课 - 1945年后的美国小说课程节选