decay radiation dose

例句：

1. 1. The old tree is decaying at the edge of the forest.
   这棵老树在森林的边缘开始衰败了。
2. 2. The soil was starting to decay due to lack of water.
   由于缺水，土壤开始衰败。
3. 3. The food in the fridge has started to decay, so we should eat it soon.
   冰箱里的食品已经开始衰败，所以我们应该尽快吃掉它。