A scalper is someone who sells tickets outside a sports ground or theatre, usually for more than their original value.

黄牛党是指在运动场或剧院之外，通常以高出原票价的价格售票的人员。

Scalpers not only make it difficult to purchase performance tickets, but also push up the price of seeing performance.

黄牛党不但让购买演出票变得困难重重，而且还推高了观看演出的价格。