来自潘立登的问题
【Hefoundthatbetweentheseyearsthecarbondioxideintheatmospherewentupfromaround315partstoaround370partspermillion.这里怎么理解二氧化碳在大气中的含量】
Hefoundthatbetweentheseyearsthecarbondioxideintheatmospherewentupfromaround315partstoaround370partspermillion.这里怎么理解二氧化碳在大气中的含量

