该协议指示出订货方必须在试图得到完全的价格计算之前，启动一个价格计算。
The protocol indicates that an orderer must initiate a price calculation before attempting to get the complete price calculation.
服务规范中的 InvoicingService 活动为使用服务操作指定了协议，在订货方和发货方角色之间能够发生的实际交流。
The InvoicingService activity in the service specification specifies the protocol for using the service operations, the actual communication that can occur between the orderer and invoicer roles.
因此，为了应对流动性危机，与美国签订货币互换协议，需要美国提供流动性支持。
Therefore, in order to deal with the liquidity crisis, and the United States signed a currency swap agreement requires the United States to provide liquidity support.
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