the highest region of the ionosphere (from 90 to 600 miles up) which contains the highest concentration of free electrons and is most useful for long-range radio transmission
例句
用作名词 (n.)
Furthermore, the distribution and variation of the electrostatic potential and layer ionospheric current density at the Northern Hemisphere are calculated by the dynamo theory. 继而从发电机理论得到了电离层电位及层电流密度在北半球的分布和变化。
用作名词 (n.)
Furthermore, the distribution and variation of the electrostatic potential and layer ionospheric current density at the Northern Hemisphere are calculated by the dynamo theory. 继而从发电机理论得到了电离层电位及层电流密度在北半球的分布和变化。
美
