markdown 大括号

Markdown语法中并没有直接支持大括号{}的标记。在Markdown中，大括号通常被用作其他目的，例如表示代码块、数学公式或HTML元素等。如果需要在Markdown中显示大括号，可以使用转义字符\进行转义，即\{和\}来表示左大括号和右大括号。例如，可以使用`\{}`来显示一个空的大括号。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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