document.write("<div class=\"prevBox\"><div class=\"prevBtn\"></div><p><a href=\"/story?sid=75052\">小鼠研究发现限制氧气摄入量与更长寿命相关</a></p></div>");document.write("<div class=\"nextBox\"><div class=\"nextBtn\"></div><p><a href=\"/story?sid=75054\">人造云从稀薄空气中发电</a></p></div>");