Calibre 嵌入中文字体有一个问题是经常认不出来中文字体的 family，结果只能嵌入正文字重，一个 workaround 是在自定义 CSS 里单独把涉及到粗体的标签指定成对应的粗体：p > b { font-family: bold_variant_of_your_font };，然后钩上 embed all fonts in the document
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