名词
中文翻译：共同的信封
同义词：
['common mail', 'joint envelope']
例句：
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1.The post office provides a common envelope forcustomers to send their letters and parcels.
邮局为顾客提供共同的信封，用于寄送信件和包裹。
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2. The coupleused a common envelope to share their weddingphotos with friends and family.
这对夫妇使用共同的信封与朋友和家人分享他们的婚礼照片。
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3. The sender included a common envelopein the package to ensure it arrived safely.
发件人将共同的信封包含在包裹中，以确保其安全到达。