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| 1. | under plain cover,ie in an envelope without any special marking |
| 在普通信封中（无特殊标记）. |
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| 2. | a card for sending messages by post without an envelope. |
| 邮寄出去传送消息的卡，没有信封。 |
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| 3. | Self-mailer: Printed piece designed to be folded and mailed without an envelope. |
| 邮简:可以不用信封，折叠后便可付邮的印刷品。 |
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| 4. | "The Chancellor of the Exchequer's budget is a back-of-the-envelope affair without any thorough-going |
| 例句：“财政大臣的预算是一个未经任何彻底研究或仔细考虑分析过的涂在信封背面上的玩意儿。” |
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