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让观众在众多动物卡片里随便选择一张，
不要给魔术师看，
然后魔术师拿出一个信封，
这个信封是个预言信封，
轻轻摇动信封，
里面会传出一种动物的声音，
而这个声音正和观众选择那张牌相对应。
此魔术来源于日本。
https://v.youku.com/v_show/id_XMTU4ODQ5NzA4OA==.html?spm=a2h0k.11417342.soresults.dtitle
Singular Sound Card
Classic Magic technology products.
Magic results:
Audience in many animals choose a random card in, do not look to the magician and the magician took out an envelope, this envelope is a prediction envelope, gently shake the envelope, which will be heard the voice of an animal, and this voice positive and the audience chooses the card corresponds.
