答：CID 字体面向大规模字符集（尤其是中日韩语言文字）做了优化，能更好支持超大字库和多种编码映射。普通 TrueType/OpenType 字体则广泛应用于日常的文档和网页设计。

"F1" in one PDF might be Arial Bold, while "F1" in another PDF might be a traditional Chinese typeface.

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Understanding CID Fonts (F1, F2, F3, F4, F5, F6, F7) and Why You Cannot "Download" Them