unburned material造句

• And because they burn at a lower temperature than hardwoods, they send more unburned materials up the chimney, leading to creosote build-up.
• A wildfire " front " is the portion sustaining continuous flaming combustion, where unburned material meets active flames, or the smoldering transition between unburned and burned material.
• Wildfires have what are known as " fronts " which is the portion of the fire that meets new, unburned material, providing additional fuel for the oncoming fire.
• Cooling of the burning zone, and loss of unburned material into the cooler, is called " flushing ", and in addition to causing lost production can cause massive damage.