Such transfer shall be effected promptly on the basis of official exchange rates or where there are no official exchange rates, at the prevailing foreign exchange market rates for current payment.

此种汇出应在正式比价的基础上，或在没有正式比价时按当时支付的有效外汇市场比价迅速办理。

youdao

In recent months, however, official inflows - largely reflecting foreign exchange market interventions by many Asian central Banks - have increased substantially.

但是，在最近几个月里，官方的流入量——大部分反映出许多亚洲中央银行对外汇市场进行干预——已经显著地增加了。

youdao

The question was whether those not engaged in legitimate trade were taking advantage of special, restricted access to China's official foreign-exchange market set up for those who need yuan to buy mainland goods.

WSJ: The View From Hong Kong: Walking a Fine Line on Yuan Trade

The government has abolished jail terms for those caught dealing in foreign currency, offered extra incentives for private investment and brought the official exchange rate closer to the black-market one.

ECONOMIST: Syria