document.write("<div class=\"prevBox\"><div class=\"prevBtn\"></div><p><a href=\"/story?sid=71851\">新加工技术让马铃薯更健康</a></p></div>");document.write("<div class=\"nextBox\"><div class=\"nextBtn\"></div><p><a href=\"/story?sid=71853\">古代 DNA 揭示黑死病的起源</a></p></div>");