名词
中文翻译：信封
同义词：
['cover', 'packet', 'parcel', 'package', 'envelope', 'wrapper']
例句：
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1. The letter was enclosed in an envelope.
信被装在信封里。
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2.Please wrap the gift in an envelope before giving it to him.
请把礼物用信封包装好再给他。
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3. The package arrived safely, and the sender included an envelope with a note inside.
包裹安全到达，发件人还在里面附了一封信。