• 1. FIRST OF EXCHANGE: 汇票正本 | 第一联汇票
• 2. First of exchange being unpaid: 付二不付一

• 1.It lasted six years from their first exchange of letters to Martin's arrival in the United States.
  从他们第一次交换信件到马丁到达美国，这段时间持续了六年。
  dict.yoduao.com
• 2."This dynamic has contributed to a new appreciation of communication itself, which is seen first of all as dialogue, exchange, solidarity and the creation of positive relations," he said.
  “这种活力有助于对交流进行新的评价，这是进行对话，交换，团结和创造积极关系的的第一步，”他说。
  dict.yoduao.com
• 3.The first one is on the exchange rate of RMB.
  一是关于人民币汇率问题。
  dict.yoduao.com

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