问题: 请帮忙翻译成英语，谢谢
挂号信通过水运是2-3个月到达，通过航空加水运是1-2个月，通过航空快运是2周左右。收到你的信后，我们将通过中国邮政走水运寄货，并会告知你包裹号。谢谢！
解答:
Certified mail will take about two to three months if send by sea, about one to two months if send by air, or about two weeks if send by air express. After we get your letter, we will send the package by sea through chinese postmaster. We will inform you the package number later. Thanks.
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