decay heat cooler

例句：

1. 1. The old tree is showing signs of decay.
   这棵老树开始出现腐烂的迹象。
2. 2. The food in the fridge has started to decay.
   冰箱里的食品已经开始变质了。
3. 3. The disease is causing the population to decay.
   这种疾病正在导致人口衰减。