document.write("<div class=\"prevBox\"><div class=\"prevBtn\"></div><p><a href=\"/story?sid=68976\">科学家用纯光创造物质证明布赖特-惠勒效应</a></p></div>");document.write("<div class=\"nextBox\"><div class=\"nextBtn\"></div><p><a href=\"/story?sid=68978\">神舟十二号返回地面</a></p></div>");