The magic envelope
本文作者： 21ST
神奇的信封What you needA deck of cards (一副牌)An envelope3A penA small piece of paperHow to playYou hold4 the cards.Put the cards on the table one by one. Ask your friend to say “stop” after a time. Now, nobody knows the top5 card of this pile (叠) of cards. |  |
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