Your passport is the most valuable document that you will carry abroad.
您的护照是您将运载海外的最可贵的文件.
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An important or valuable document is best sent by ( registered ) mail.
重要或有价值的文件最好用挂号信寄.
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The valuable document almost did not arrive in time.
这项珍贵的文件当时几乎就要来不及到达了.
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