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<html lang="zh">
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    </style>
  <style type="text/css">
            span{
                display: inline-block;
                width:30px;
                word-break: keep-all;
                overflow: hidden;
                text-overflow: ellipsis;
            }
            span:hover{
                overflow: visible;
            }
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<body>

            <span>
              <a href="http://www.nuei.cn">看不见00000000000000</a>
            </span>
</body>
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