Subject + 冒 + 出 + Noun
冒 (mào) is a verb meaning "to emit," "to give off," or "to rise up." It describes something emerging outward or upward from a source, such as smoke, steam, or flames. Unlike the compound 冒出, the single character 冒 can also mean "to brave" or "to risk" in other contexts.
锅里的水开了,不停地冒热气。
guō lǐ de shuǐ kāi le, bù tíng de mào rèqì.
The water in the pot is boiling, continuously giving off steam.
远处的山顶正在冒烟,好像是火山。
yuǎnchù de shāndǐng zhèngzài mào yān, hǎoxiàng shì huǒshān.
The distant mountaintop is emitting smoke; it seems to be a volcano.
他跑完步后满头冒汗。
tā pǎo wán bù hòu mǎn tóu mào hàn.
After his run, his head was dripping with sweat.