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

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

Many of us spend our lives in black, brown, navy, white and grey, but by choosing safe shades instead of a brighter wardrobe, we could be missing out on the health benefits implicit1 in color.

生活中的很多人喜欢穿着黑色，棕色，深蓝色，白色和灰色的衣服，如果我们总选择低沉颜色而不尝试更亮丽的服装，可能会错失亮色可能带来的一些健康有利因素。

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