underground economy

• 地下经济

underground economy的用法和样例：

例句

1. The report also factors in the underground economy.
   该报告也计入了地下经济因素。
2. During that period, underground economies have sprung up around the trade of virtual game goods, like swords, helmets, and skill points.
   在此期间，地下经济体系围绕虚拟游戏商品贸易，如刀剑，头盔，和技能点已经涌现出来。