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1. The envelope detector detected ahidden message in the mail.
信封探测器在邮件中检测到了隐藏的信息。
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2. The envelopedetector was used to detect the presence ofdrugs in the package.
信封探测器用于检测包裹中的药物存在。
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3. The envelope detector wasdesigned to prevent theft by detectingunauthorized access to the mail.
信封探测器被设计用来防止盗窃，通过检测未经授权访问邮件的行为。