“polar night”的概念、定义、翻译、参考文献-科学参考

单词	polar night
释义	polar night [`pō·lǝr `nīt] ^ASTRONOMY The period of winter darkness in the polar regions, both northern and southern.
随便看	hem-, hema-, hemo-, haem- hemi- hemiacetal hemianesthesia hemianopsia Hemiascomycetes Hemiascomycetidae hemiazygous vein hemiballismus Hemibasidiomycetes hemicellulose hemicephaly Hemichordata Hemicidaridae Hemicidaroida hemic murmur hemicolectomy hemicone hemicryptophyte hemicrystalline hemicycle hemicydic hemidiaphragm Hemidiscosa hemihedral symmetry

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