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By the way, may I use a window envelope?
顺便问一下，我可以用开窗信封吗？
youdao
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The address must be clearly visible through the window of the envelope.
从信封的透明窗必须能够看清楚地址。
《牛津词典》
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The address must be clearly visible through the window of the envelope.
从信封的透明窗必须能够看清楚地址。
《牛津词典》