短語詞組短語polar night vortex 極夜渦鏇polar stratospheric vortex [地物]平流層極地渦鏇breakdown of polar vortex 崩潰過程polar vortex index 極渦指數(shù)the polar vortex 極渦intensity of polar vortex 極渦強度stratospheric polar vortex 平流層極渦north polar vortex 北極渦 返回 polar vortex