名词
中文翻译：背面的邮票
同义词：
['stamp', 'postmark']
例句：
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1. The back stamp on the envelope isfrom a distant relative.
信封上的背面邮票是远房亲戚寄来的。
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2. The stampcollector has collected hundreds of different types ofstamps.
集邮爱好者已经收集了数百种不同类型的邮票。
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3. The postmark onthe package indicates that it was delivered tothe recipient's home address.
包裹上的邮戳表明它被投递到了收件人的住宅地址。