mould in a snap flask

例句：

1. 1. The old clothes were badly stained with mould.
   旧衣服被霉菌严重染色。
2. 2. The food was spoiled by the mold in the fridge.
   冰箱里的食品被霉菌破坏了。
3. 3. The mold grew on the wall, making it difficult to clean.
   墙上长满了霉菌，很难清洁。