名词
中文翻译：外围信封
同义词：
['peripheral envelope', 'peripheral envelopes']
例句：
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1. The company's new policy is to provide a peripheral envelope for employees to use during their breaks.
公司新政策是为员工提供在休息时间使用的外围信封。
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2. The envelope was sealed with a ribbon and placed in the outer envelope.
信封用丝带封口，并放在外层信封中。
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3.The envelope was addressed to the recipient and then sealed with adhesive tape.
信封被寄件人地址后，再用胶带密封。