Yellow refers to the smutty type, and grey or black to spam messages, many of which offer products or services of various shades of legality.

黄段子是指那些含有内容淫秽的短信，灰段子和黑段子是指那些提供法律灰色地带产品和服务的垃圾信息。

youdao

The coat must be of one over-all color at the skin but may be of varying shades of the same color in the full coat, which may be black, blue, dark or light grey, silver platinum, fawn or cream.

皮肤被毛必须为一个完整的颜色，但可以有相同颜色的色调变化，可以为黑色、深色或浅灰色，或银白色，浅黄褐色或奶油色。

youdao

Rarely has a game summed up a player so perfectly, encapsulating all the contradictions and painting him in black and white - and shades of grey.

很少有一场比赛能如此完美的总结一名球员，浓缩所有的矛盾，涂抹出他的黑与白。

youdao

Said covers will come in red, yellow, black and white, offering a splash of color to the three understated monochrome shades (white, grey and black) of the hardware.

ENGADGET

It is worth waving away this fog of dogma that dominates much discussion involving America to consider that, even in a world characterised by realpolitik with its shades of grey, there remain issues in black and white.

ECONOMIST: Letters | The