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envelopes的英文翻譯是什麼意思，詞典釋義與在線翻譯：
英英釋義
名詞 envelope:
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a flat (usually rectangular) container for a letter, thin package, etc.
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any wrapper or covering
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a curve that is tangent to each of a family of curves
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a natural covering (as by a fluid)
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the maximum operating capability of a system (especially an aircraft)
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the bag containing the gas in a balloon
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enclose or enfold completely with or as if with a covering
