我们在体育馆外遇到了几个黄牛，他们正在高价倒卖球赛门票。

We met some ___scalpers outside the stadium who were reselling game tickets at outrageous prices.

这位短线交易者在加密货币市场中频繁买卖，利用微小价格波动获利。

The ___scalper makes quick trades in the crypto market to capitalize on small price changes.