名词
中文翻译：航空信
同义词：
['mail', 'postcard']
例句：
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1.She sent an airletter to her friend in Paris.
她给在巴黎的朋友寄了一封信。
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2. The post office has a large collection of airletters for sale.
邮局有大量出售的明信片。
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3.I received a lovely airletter from my sister last week.
上周我收到了姐姐的一封可爱的明信片。