We are in regular communication by letter.
我们定期通信联系。
We usually accept letter of credit for regular orders.
对于普通订单，我们通常采用信用证支付。
You can send the letter by airmail (regular mail, registered mail).
你可以邮寄航空信(平信、挂号信)。
How long does it take a letter to get there by regular mail?
一封普通信寄到那里要花多长时间？
How long does it take a letter to get there by regular mail?
一封普通信寄到那里要花多长时间？
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