n.涂黑；烧黑；变黑；炭粉；黑度
动词blacken的现在分词形式.
Hellish flames billowed upward, blackening the groaning roofbeams. 地狱般的火焰向上翻滚着巨浪，烧黑了房梁，发出嘎吱声。
The output signal from the detector may be the blackening of a photographic emulsion. 探测器的输出信号可以是照相乳胶的黑度。
