document.write("<div class=\"prevBox\"><div class=\"prevBtn\"></div><p><a href=\"/story?sid=84693\">美国扩大中国科技设备进口禁令</a></p></div>");document.write("<div class=\"nextBox\"><div class=\"nextBtn\"></div><p><a href=\"/story?sid=84695\">AI 促使数学家思考数学对他们的意义</a></p></div>");