thermal decomposition
noun [uncountable] (the process in which one substances in broken down by heat into two or more simpler substances 热分解：将一种物质通过热分解为两种或更多种简单物质的过程 Thermal decomposition of limestone is one of the processes that occurs in a blast furnace. 石灰石的热分解是高炉中发生的过程之一。