两个div上下并排，各自里面table列数相同，怎么使对应的列对齐？

Question

<div>
  <table>
    <tr>
      <td></td>
      <td></td>
    </tr> 
  </table>
</div>
<div>
  <table>
    <tr>
      <td></td>
      <td></td>
    </tr> 
  </table>
</div>

Answer 1

Answer 2

<div>
  <table>
    <tr>
      <td width="200"></td>
      <td></td>
    </tr> 
  </table>
</div>
<div>
  <table>
    <tr>
      <td width="200"></td>
      <td></td>
    </tr> 
  </table>
</div>