If it feels hot, there may be smoke or fire behind the door, so take care.
如果感觉很热,门后可能有烟或火,所以要小心。
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It was a windowless erection used for storage, and from the open door there floated into the obscurity a mist of yellow radiance, which at first Tess thought to be illuminated smoke.
Close yourself in a smoke-free room and place a wet towel underneath the door to prevent any smoke from entering, says Dan McBride, a firefighter in New York City.