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您好，有人可以帮我删除表格底部的下划线吗？这是我的代码，
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<td><iframe src="//player.vimeo.com/video/99579066" width="220" height="150" frameborder="0" allowfullscreen="allowfullscreen"></iframe><a href="http://vimeo.com/99579066"><b><span style="font-size: small;">Talk About Who Is Daniel Renneberg</span></b></a>.</td>
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问题截图: