transparency
n
1 [U] state of being transparent 透明; 明显; 清楚.
2 [C] photograph printed on transparent plastic, so that it can be viewed by shining a light through it; slide1(4a) 幻灯片; 透明正片.
My dear friend, Mathilde. Let me tell you something. That necklace you borrowed from me wasn't a real diamond necklace. It wasn't valuable at all. The stones in the necklace were made of glass. It was worth five hundred francs at the most.