煤烟通常是燃料不完全燃烧的产物。
Soot is usually the product of the imperfect combustion of fuel.
youdao
煤烟是燃料不完全燃烧的产物。
Soot is the product of the imperfect combustion of fuel.
应用推荐
模块上移
模块下移
不移动