搜索结果: 1-1 共查到“大气科学 ups and downs”相关记录1条 . 查询时间(0.044 秒)
![](http://www.firstlight.cn/upload/imgfile/20143/20/2014320163636502.jpg)
The period of extended low oxygen, which spanned from roughly 2 to less than 1 billion years ago, was a time of remarkable chemical stability in the Earth's oceans and atmosphere. A University of Cali...