The rates at which the banks sell foreign exchange ( selling rates ) are higher than the rates at which they buy ( buying rates ) 银行卖出外汇的汇率（卖出价）高于买入外汇的汇率（买入价） 。
4.
The people ' s bank of china has been able to sterilise the monetary impact of the massive purchases of foreign currency it has undertaken to keep the exchange rate down ( see charts ) 为将汇率保持在低水平，中国央行买进了大量外汇，但它一直能够冲销大规模买入外汇对货币政策的影响（见图表） 。
