The chimney is almost choked up with soot. 烟囱几乎被烟垢堵住了。
Let it become downright black, and it is still sightly , especially if its trimmings are of white stone, with soot in the depths and the high spots washed by the rain. 红砖就算被染得漆黑，看起来还是能够使人悦目，尤其是如果用白石镶边，经雨水一洗刷，凹处烟垢残存，凸处本色外露，红黑映衬，更觉美观。
