soot
n. 煤烟，烟灰
vt. 用煤烟熏黑；以煤烟弄脏
例句
Their faces were blackened with soot.
他们满脸煤灰。
《牛津词典》
The parks and squares looked grim under a mantle of soot and ash.
在一层烟尘的笼罩下，这些公园和广场显得阴沉沉的。
《柯林斯英汉双解大词典》
"That's Soot," said Mary.
“那就是煤灰。”玛丽说。
