Arbitrage refers to the activity of using the exchange rate difference between two or more different markets to buy a currency in the low price market and sell it in the high price market to earn profits.

套汇是指利用两个或两个以上不同市场的汇率差价，在低价市场买入某种货币，同时在高价市场卖出该种货币，以赚取利润的活动。