You can produce a horizontal rule tag (<hr />) by placing three or more hyphens, asterisks, or underscores on a line by themselves. If you wish, you may use spaces between the hyphens or asterisks. Each of the following lines will produce a horizontal rule:
使用三个甚至更多的 星号/下划线 就可以产生一条水平线,并且他们中间可以加入空格
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