Their faces were blackened with soot.他们满脸煤灰。Soot is the product of the imperfect combustion of fuel.煤烟是燃料不完全燃烧的产物.Soot is usually the product of the imperfect combustion of fuel.煤烟通常是燃料不完全燃烧的产物....
What's the maximum amount of wine you're allowed to take through customs duty - free ?海关准许携带酒类的最大 免税 限量是 多少 ?Did you have to pay customs duty on that?你们必须为此给顾客付款 吗 ?Customs duty is a toll payable on merchandise...