In the time scale of 10 8 years or longer, the geomagnetic field is characterised by polarity bias.
对于１０８年或更长的地史时期而言，地磁场表现出偏极性特征。
UV-vis spectrum and polarized light property of GDSA-Cu(Ⅱ) metal complexes;
改性灰D(GDSA)与Cu~(2+)离子形成配合物的紫外-可见光谱及偏光性能
