document.write("<div class=\"prevBox\"><div class=\"prevBtn\"></div><p><a href=\"/story?sid=70478\">空气污染导致授粉昆虫数量减少七成</a></p></div>");document.write("<div class=\"nextBox\"><div class=\"nextBtn\"></div><p><a href=\"/story?sid=70480\">研究人员发现火星地震后巨石翻滚的证据</a></p></div>");