未燃的

例句：

1. 1. The fire was extinguished before it could fully unburn.
   火势在完全熄灭前已经减弱了。
2. 2.The steak was unburned on the outside but still slightly charred on the inside.
   牛排外层未烧焦，但内里还有轻微烧焦的痕迹。
3. 3.Before the firefighters arrived, the building was unburned and evacuated safely.
   消防员到来之前，大楼未被烧毁且已安全疏散。