A hypothetical substance formerly thought to be a volatile constituent of all combustible substances released as flame in combustion.
燃素, 热素原来假设的在所有燃烧物质中挥发性的一种物质成分, 在燃烧中作为火焰而被释放出来
Before mixing with the products of combustion, the air is preheated.
空气在与燃烧生成物混合之前要进行预热。
The spontaneous combustion of the oil-soaked rags caused the barn to catch fire.
油布碎片的自燃使谷仓起火。
