decay missing filling tooth

例句：

1. 1. The old tree is slowly decaying due to neglect.
   由于忽视，这棵老树正在慢慢腐烂。
2. 2. The soil around the plant is starting to decay.
   植物周围的土壤开始腐烂了。
3. 3. The food in the fridge has started to decay.
   冰箱里的食品已经开始变质了。