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。
In 1873 the Italian scientist Camillo Golgi developed a black stain to highlight the micron-thin neural strands.
使用这种黑色染料我们可以将染色局限在一小部分的细胞和它们的衍生部分；运气好的话，我们甚至可以获得对于整个中枢神经组织的完整视野。
The use of the black dye can be limited to a small number of cells or to more extensive groups; occasionally one may even obtain a comprehensive view of an entire area of the central nervous system.
有一条黑色的运河，还有一条流淌着恶臭染料的紫色河流。
It had a black canal in it, and a river that ran purple with ill-smelling dye.
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