Opera浏览器中的Colspans无法正常工作

我不能理解这里的问题,但在所有浏览器cept Opera中这看起来都很好。

HTML代码如下:

<table width="395" height="214" border="1">
  <tr>
    <td colspan="2">Here is some content in here that has 2 colspans</td>
    <td width="137">This only has 1 colspan.</td>
  </tr>
  <tr>
    <td width="113">This has only 1 colspan also.</td>
    <td colspan="2">This cell has 2 colspans now and should look presentable hopefully.</td>
  </tr>
  <tr>
    <td colspan="3">This cell has 3 colspans within this table and should fill up the entire width of the table.</td>
  </tr>
</table>

现在Opera的输出是这样的:

但是我如何使它看起来像这样(就像所有其他浏览器一样):

这个问题实际上比这个要深得多,但这是主要的基本问题。