1. In the spring fire swept across the hills, blackening them. 今春的一场大火横扫了这些山，变成了黑色。
2. The blast left a gaping hole in the front window and shattered a glass door, twisting and blackening its metal frame. 这起爆炸事件将征兵站前窗炸出裂孔，并将玻璃门炸得粉碎而金属框架变形发黑。
3. In this paper, a new technology is determined by means of traditional oxidation and phosphatization so that it can be applied to the blackening for fastener. 通过集传统的氧化，磷化工艺与一体化的试验研究，确定一种黑化处理的新型工艺，以期应用于紧固件的黑化处理中。
