硝烟

xiāo yān gǔn gǔn

硝烟滚滚

billows of powder smoke

xiāo yān sàn jìn

硝烟散尽

the smoke of gunpowder disperses

xiāo yān mí màn

硝烟弥漫

be thick with fumes of gunpowder

zhàn zhēng de fēng huǒ xiāo yān yǐ jīng xiāo sàn

战争的烽火硝烟已经消散。

The flames and smoke of war had dissipated.

zhè yī lùn diǎn de xiāo yān zǎo yǐ sàn qù

这一论点的硝烟早已散去。

That argument ended long ago.