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一般情况下,一个正常的人每年平均要消化1吨的食物与饮料。人类对于数字的短暂记忆能力只能维持在5至9个位的水平,因此,电话号码通常只有七位数字。
Under normal circumstances, a normal person to digest an average of 1 ton of food and drink. The human memory of the number of short-term memory can only be maintained at the level of 5-9, so the phone number is usually only seven digits.