the grey market

剑桥词典

an unofficial but not completely illegal system in which products are bought and sold
（非正式但并不完全非法的）灰色市场
The store sells designer clothes and shoes sourced from the grey market . 这家商店出售从灰色市场进货的名牌服装和鞋子。
比较
black market

buying and selling of a company's shares before they are available officially
（在公司股票尚未正式发放时进行交易的）股票灰色市场，暗盘市场
First dealings in the company's shares will start on the grey market on 27 March and formal trading begins on 2 April . 这家公司的股票将于3月27日开始进入暗盘市场，然后在4月2日正式上市交易。

people over about 50, considered as a group to which products can be sold
针对50岁以上人群的市场，白发市场
Motorbike manufacturers are selling to the grey market as much as to younger people . 摩托车制造商们卖给白发市场的摩托车和卖给年轻人的一样多。 返回 the grey market