kiln stain

例句：

1. 1.The pottery has a distinctive kilnstain on the surface.
   这个陶器表面有独特的窑烧色斑。
2. 2.The old painting had been exposed to the sun for many years, revealing its kilnstain.
   这幅旧画暴露在阳光下多年，露出了它的窑烧痕迹。
3. 3. The wine bottle's label shows a kilnstain from the winery's aging process.
   这个酒瓶的标签上显示了酒厂老化过程中的窑烧痕迹。