在一项实验中，研究者在一张纸上向所罗门·舍雷舍夫斯基展示了一个含有30个字母和数字的复杂公式。
In one experiment, researchers showed Shereshevskii a complex formula of thirty letters and Numbers on a piece of paper.
子项是字符信息项，即包含字母数字字符的项。
The child is the character information item, meaning that the item contains alphanumerical characters.
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