同义词： D-layer
d connected region labeling三维连通标记
limited d proportionality region有限正比区
Buried d diffusion region隐埋扩散区
field d oxide region场氧化区
d-region stabilityd域稳定性
d-regiond层
Sound d shadow region声影区
D - regionD区
d face region extraction三维人脸提取
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