n.分解；腐烂；变质

This type of thermal decomposition is called pyrolysis. 这种类型的热分解反应称做热解。

Warmer weather meant the decomposition of the corpse. 天气变暖会使尸体腐烂。

A plastic sheet was pegged down over the compost heap to hasten decomposition. 把塑料布铺盖在肥堆上，并用木桩固定好，以加速肥料腐烂。