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在一个电视竞技节目中,一个选手在较短的时间内,在桌面上斜立起十几个易拉罐．你也可以动手试验,但会发现不易成功．你可知道其中有什么奥秘?
In a televised show, a competitor slanted more than a dozen cans on the desktop in a short period of time. You can also experiment, but you will find it difficult to succeed. Do you know what mysteries are?