to decay

例句：

1. 1.The old tree is slowly to decay.
   这棵老树正在慢慢腐烂。
2. 2.The food in the fridge is starting to to decay.
   冰箱里的食品开始变质了。
3. 3.The soil around the plant is beginning to to decay.
   植物周围的土壤开始腐烂了。