-d -layer model二维两层模型
D-layer theory on proof standard多层次证明标准
-d boundary layer三维边界层
-d compressible mixing layer可压缩混合层
-d compressible boundary layer二维可压缩边界层
-d supersonic mixing layer三维超音速混合层
3-d boundary layer三维边界层
-d surface layer model三维表层模型
3-d compressible mixing layer可压缩混合层
N（名词） the lowest region of the ionosphere, extending from a height of about 60 kilometres to about 90 kilometres: contains a low concentration of free electrons and reflects low-frequency radio waves D域; 电离层的最低区域 → see also ionosphere