Blackening

例句:

• There was no powder-blackening on the clothes. 阿瑟·柯南·道尔. 福尔摩斯回忆录.
• They stood together minute after minute, without further speech, each looking at the blackening scene, and each thinking his and her own thoughts. 托马斯·哈代. 还乡.
• In 1801 Ritter proved the existence of such invisible rays beyond the violet end of the visible spectrum by the power they possessed of blackening chloride of silver. Edward W. Byrn. 十九世纪发明进展.

杰克逊整理