"variable">
            <tr>
                <th class="scene_desc" colspan="3">数据</th>
            </tr>
            <tr>
                <td class="symbol"><img src="variable_rank.svg"/></td>
                <td>秩（节点的高度）</td>
                <td class="code">rank</td>
            </tr>
            </tbody>
        </table>
        <br/>
        <table class="items" cellspacing="0">
            <tbody id="formula">
            <tr>
                <th class="scene_desc" colspan="3">合�