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He placed the paper in a plain envelope.
他把论文放在一个空白信封里。
《柯林斯英汉双解大词典》
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Invite your partner on a date by sending her a plain brown envelope containing a tape.
假如要约对方，发一封信，里面放一盘磁带。
youdao
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Invite your partner on a date by sending her a plain brown envelope containing a tape.
假如要约对方，发一封信，里面放一盘磁带。
youdao