有的人低价买进，高价卖出。
如果你想赚钱的话，你就必须低价买进，高价卖出。
If you want to make money, you must buy cheap and sell dear.
套汇商是利用市场间暂时的汇率差额低价买进，高价售出的人。
Arbitrageurs are individuals who take advantage of any temporary difference in exchange rates across markets to buy low and sell high.
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