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行间公式测试：$$a + \frac{|ac| \vec{n_1}+|ab| \vec{n_2}}{2 sin\theta}$$行内公式测试：其中 $\vec{n_1}$ 和 $\vec{n_2... 1970-01-01T00:00:00+00:00 Typecho https://dhui626.github.io/index.php/feed/atom/archives/6/