这位套利者同时在东京和悉尼的外汇市场上进行交易，利用汇率差异获利。

The ___arbitrageur traded simultaneously in Tokyo and Sydney forex markets to profit from exchange rate differences.

这位套利者利用不同市场的价格差异快速买入卖出，赚取了丰厚利润。

The ___arbitrageur made huge profits by quickly buying and selling assets to exploit price differences between markets.