coefficient of opacity nontransparency

例句：

1. 1. The film is so dark that it's almost impossible to tell the difference between the foreground and background.
   这部电影太暗了，几乎无法分辨前景和背景。
2. 2. The new paint job has increased the room's opacity significantly.
   新的油漆工作显著提高了房间的透明度。
3. 3. The scientist used a special filter to increase the opacity of the sample.
   科学家使用一种特殊的过滤器来增加样本的透明度。