[Font] 英文字体间距变宽之根源

根源：
用中文字体显示英文

根本解决办法：
用英文字体显示英文，用中文字体显示中文

具体操作：
如果可行，则对中文英文分别指定字体
否则对于中文指定英文字体，不要仅仅指定serif, sans serif 或者 monospace
比如在firefox里Monospace就用Bitstream Vera Sans Mono
这样英文就肯定会用Bitstream Vera Sans Mono
对于中文，fontconfig就会找替换列表里排最前的一个,我的是SimSun

否则如果Monospace里指定的是monospace，
那么简体中文网页个别时候（css可以指定字体，所以不是全部）以及查看简体中文网页的源代码时，firefox就会用排在第一位的简体中文字体来显示所有中英文内容，之前我的是NSimSun

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