问题: 请汉译英
因我们居住的环境人员繁杂，寄来的普通邮件有的可能会丢失，你们发来的课程注册说明书一直没有收到。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。谢谢！
解答:
Due to the fact that our community is crowded with people of various social backgrounds,the ordinary mails may have a risk of getting lost.Till the moment we still haven't received your instruction book of course registration,or any other mails you ever sent to us.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.Thank you.
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