pyritized

例句：

1. 1. The paint on the wall has been pyritized by the sun's rays.
   墙上的油漆被阳光照射得发黑了。
2. 2.As the fire burned, it pyritized the wood around it.
   随着火势蔓延，它使周围的木头变黑了。
3. 3. The old book was so worn out that it had been pyritized by years of use.
   那本旧书磨损得太厉害了，以至于被使用多年而变黑了。