摘要
科学家使用先进的远程监控技术,详细地记录了象海豹的睡眠奇迹,其中很多有趣的细节首次为人们所知。
1 If youve ever seen elephant seals lying on a beach,you might think all they do is sleep.But scientists have discovered that when elephant seals are in the ocean,they hardly sleep at all.On average,elephant seals sleep just two hours a day.
