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1.The envelope method is a popular way to send letters and packages.
信封法是一种流行的发送信件和包裹的方法。
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2. The envelope method is used to protect the contents of an envelope during transportation.
信封法用于在运输过程中保护信封内的内容。
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3. The envelope method is also used in some countries for tax purposes.
信封法在一些国家用于税务目的。