The black stain problem in enamelled wires production is systematically discussed.

本文就漆包线成品黑斑问题进行了全面讨论。

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In 1873 the Italian scientist Camillo Golgi developed a black stain to highlight the micron-thin neural strands.

1873年，意大利科学家卡米洛·高尔基（Camillo Golgi）发明了一种黑色染料，可以对极细的神经索进行染色。

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Meanwhile our roaring creek was still at it, but thinner and more quiet now, running from the cliff face itself a mile up the valley in a big black stain I could see in the gray rock.

于此同时我们那轰鸣的溪流依然固我，但它如今变得瘦弱淡静，从一里外山谷上灰暗石头中我能看到的一个黑色大污点，朝崖面飞奔逃离自己。

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There is no narrative in the 1971 picture of the interior of an oven, just the white-speckled black enamel with a bit of food stain on the steel racks.

WSJ: A Challenge to the Pretty Ones | William Eggleston | At War With the Obvious | By William Meyers

They were, understandably, deeply offensive to black Americans and all others who regard segregation as a terrible stain on this Nation's history.

CENTERFORSECURITYPOLICY: Dustbin Durbin