“permanent shadow region”的概念、定义、翻译、参考文献-科学参考

单词	permanent shadow region
释义	permanent shadow region Encyclopedia 理学〔月球构造〕释 permanent shadow region永久阴影区在自转轴与其黄道面交角很小的天体的极区存在的常年未受阳光直射的区域。简称PSR。
随便看	vacuum preloading vacuum pressure die casting vacuum pressurizing casting vacuum prism spectrograph vacuum pump vacuum pump oil vacuum rapidly quenched amorphous alloy strip vacuum rapidly quenched Ti- based brazing alloy vacuum regulating valve vacuum resistance furnace vacuum sensor vacuum sintering vacuum solar telescope vacuum solar tower vacuum sparking vacuum spectral region vacuum spectrograph vacuum spontaneous breaking vacuum stability vacuum state vacuum suction disc vacuum surface insulation vacuum susceptibility vacuum switch device vacuum system

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