Given HTML:
<html>
<body>
<table>
<tr><td>Hello</td><td>World</td></tr>
<tr><td>I'm</td><td><a href="http://www.example.com/">Batman</a></td></tr>
</table>
</body>
</html>
You can use the following locator to reference in the second column of the second row:
css=tr:nth-child(2) > td:nth-child(2) > a
Update:
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