black stain

基本解釋

In 1873 the Italian scientist Camillo Golgi developed a black stain to highlight the micron-thin neural strands.
1873年，意大利科學(xué)家卡米洛·高爾基（Camillo Golgi）發(fā)明了一種黑色染料，可以對(duì)極細(xì)的神經(jīng)索進(jìn)行染色。
In a painter's house, I saw a very special painting which was a piece of munted white paper, on the left middle of which there was a black stain.
在畫家的房子裡，我看到一幅極其特別的畫：那是一張經(jīng)過裝裱的白紙，但在其左側(cè)正中有一個(gè)黑點(diǎn)。
baicaoyuanrena.blog.163.com
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.
於此同時(shí)我們那轟鳴的谿流依然固我，但它如今變得瘦弱淡靜，從一裡外山穀上灰暗石頭中我能看到的一個(gè)黑色大汙點(diǎn)，朝崖麪飛奔逃離自己。
blog.sina.com.cn

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