银行卖出外汇的汇率（卖出价）高于买入外汇的汇率（买入价）。
The rates at which the banks sell foreign exchange (selling rates) are higher than the rates at which they buy (buying rates).
boc获取中国银行美金汇率，只有卖出价。
Bank of China to get U. S. currency, only the selling price.
boc获取中国银行美金汇率，只有卖出价。
Bank of China to get U. S. currency, only the selling price.
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