名词
中文翻译：邮戳
同义词：
['mail mark', 'postmark', 'postmark date']
例句：
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1.The postmark on the letter indicates that it was delivered on a certain day.
信上的邮戳表明它在某个特定的日子被投递。
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2.The postmark on the envelope is from the sender's address.
信封上的邮戳是发件人的地址。
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3. I found the postmark on the package to be interesting and decided to investigate further.
我发现包裹上的邮戳很吸引人，决定进一步调查。