请你们在过去或将来发送邮件时及时告诉邮件编号，以方便网上跟踪查询。
It will be highly appreciated if you'd like to inform us with the mails', which you have sent and will send to us, serial Numbers in time for us to trace them online.
请你们在过去或将来发送邮件时及时告诉邮件编号，以方便网上跟踪查询。
It will be highly appreciated if you'd like to inform us with the mails', which you have sent and will send to us, serial Numbers in time for us to trace them online.
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