document.write("<div class=\"prevBox\"><div class=\"prevBtn\"></div><p><a href=\"/story?sid=69253\">物种大灭绝如何促使蛇类兴起</a></p></div>");document.write("<div class=\"nextBox\"><div class=\"nextBtn\"></div><p><a href=\"/story?sid=69255\">Google 发布勒索软件分析报告</a></p></div>");