background reflectance

例句：

1. 1.The new paint job has a high background reflectance, which can make the room look darker.
   新的油漆工作有高的背景反射率，这可以使房间看起来更暗。
2. 2. The artist used a technique to increase the background reflectance of the painting.
   艺术家使用了一种技术来增加画作的背景反射率。
3. 3. The color of the fabric is important because it affects the background reflectance.
   织物的颜色很重要，因为它会影响背景反射率。