·2,447,543篇论文数据，部分数据来源于NoteExpress
拥有正规来源，正规的二维码一般会在二维码展现页面注明来源，使每个二维码都安全且有迹可寻。
1 has a formal source, the formal two-dimensional code will generally show the source code in the two-dimensional code page, so that each two-dimensional code are safe and trace can be found.
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