decay

The fallen leaves began to decay on the forest floor, turning into rich soil.

(Chinese) 落叶开始在森林地面上腐烂，变成了肥沃的土壤。

Eating too much sugar without brushing your teeth can cause them to decay quickly.

(Chinese) 吃太多糖又不刷牙会导致牙齿迅速腐烂。

The old castle fell into a state of decay after being abandoned for a century.

(Chinese) 这座古堡在被遗弃了一个世纪后陷入了破败状态。

Economic decay in the region led to many families moving to the capital city.

(Chinese) 该地区的经济衰退导致许多家庭迁往首都。