document.write("<div class=\"prevBox\"><div class=\"prevBtn\"></div><p><a href=\"/story?sid=68769\">不同 RNA 疫苗产生抗体的水平似存在差异</a></p></div>");document.write("<div class=\"nextBox\"><div class=\"nextBtn\"></div><p><a href=\"/story?sid=68771\">最后一台转子密码机的历史</a></p></div>");