smut

例句：

1. 1. The old house had a lot of smut on the walls.
   这所旧房子的墙上有很多霉菌。
2. 2. The food was spoiled due to poor storage conditions, causing smut growth.
   由于储存条件不佳，食物发霉了。
3. 3. In some areas, smut can be a serious health hazard.
   在一些地区，霉菌可以是一种严重的健康威胁。