名词
中文翻译：双重地址
同义词：
['双地址，双重署名，双重签名例句：1. The double-address system is used to ensure confidentiality.（双重地址系统用于确保机密性。）2. He double-addressed the letter to both his parents and his boss.（他给父母和老板都写了信。）']
例句：
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1. The double-address system is used to ensure confidentiality.
双重地址系统用于确保机密性。
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2. He double-addressed the letter to both his parents and his boss.
他给父母和老板都写了信。
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3. The sender double-addressed the envelope to avoid misinterpretation.
寄件人为了避免误解，将信封双重地址。