求翻译：在最短时间内记忆100个无规律数字，观察黑板上的100个数字，然后依次背出来，不能有任何错误。我已经练习了4年，最短用时1分钟。所需设备是黑板.粉笔。这是很值得挑战的。是什么意思？

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within the shortest time an irregular figures 100 memory, observation 100 figures on the blackboard and then back out, and there is no error. I have been practicing 4 years and the shortest 1 minutes. The required equipment is blackboard chalk . . This is very worthy of the challenge.

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Memory 100 irregular figures in the shortest time, observe 100 numbers on the Blackboard, then back out, and there is no error. I have practiced for 4 years, the shortest time 1 minute. Equipment required is Blackboard. chalk. It is open to challenge.

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