求翻译：网7月12日电 据共同社报道，关于日本福岛第一核电站的高辐射污水渗入地下的问题，日本核电站事故担当相细野豪志11日在众院东日本大地震复兴特别委员会上表示，为防止污染扩散计划修建的“隔水墙”的动工时间将提前至年内。是什么意思？

Network, July 12 's Kyodo News Agency reported that Japan Fukushima high radiation problem of sewage into the underground of the first nuclear power plant, Japan nuclear accident played Xiang Xiye Hao Chi 11th House East Japan earthquake rehabilitation Special Committee said, for the spread of pollution prevention plans to build the "water wall" start time to the year ahead.