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在打开mathtype时，会提示我们mathtype需要安装，一个较新版本的mt extra (truetype)字体，这是因为系统没有mt extra (truetype)字体，或此字体的版本太低，缺少.
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- South African Flag Vector
- Felipe Massa
- South African Landscape Hd
- Ibest
- Maple Leaf Silhouette Clip Art
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