汇率是指的美元兑换人民币的汇率。也就是说如果你想买的那个东西30美元,你需要支付30x7.5的人民币。现在人民币和美元的汇率是6.2,他要7.5,也就是赚差价1.3,他赚的价钱就是你要买的东西的美元价格x1.3,这个价格算是你支付给他的佣金。
The exchange rate refers to the exchange rate of US dollars to RMB. That is to say, if the item you want to buy is 30 US dollars, you need to pay 30 x 7.5 RMB. Now the exchange rate between RMB and US dollars is 6.2, and they want 7.5, which means they make a profit of 1.3. The price they make is the US dollar price of the item you want to buy x 1.3. This price is the commission you pay to them.