·2,447,543篇论文数据，部分数据来源于NoteExpress
That process, which involves radiating incoming mail, can easily take a week or more, making it likely the letters were mailed well ahead of the bombing.
由于包括对收到的邮件进行放射性照射，安检过程动辄需要一周或者更久，这使得这些邮件正好在爆炸前寄到。
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