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<p style="text-indent: 2em;">献县单桥横跨滹沱河故道，是一座始建于明代的石拱桥。2006年，单桥被列为全国重点文物保护单位。</p>
<p style="text-align: left;">拍摄丨李莹、蔡晓强、史明鉴、李金峰</p>
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