发黑是钢铁表面处理的一种方法。
n. nigrescence
misc. black coating ; nigrities
原来白色的铅颜料已经氧化发黑了。
The original white lead pigments have oxidized and turned black.
他气得脸色发黑，但他看到他们说的是实话，吃了一惊。
His face had gone black with rage, but he saw that they believed their words, and he was startled.
当他把药递给下一个赶狗人时，香农的脸冻得发黑。
When he handed the medicine to the next musher, Shannon's face was black from the extreme cold.
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