Where had she been. The young man's kind eyes looked deeply into Sylvie's own dark gray ones.

VOA: special.2010.04.03

Well, the ones in director light must not be so reflective but be kind of of dark surface.

然而，直接处于光线之下的瓷片不会如此反光,它们的表面较暗。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选