单词	外部观察
释义	外部观察external observation
随便看	downward cumulation downward demand spiral downward-diffusion cloud downward-diffusion cloud chamber downward displacement downward drift downward enrichment downward enrichment downward flow downward flux fraction downward flux fraction [of a luminaire] downward flux fraction(of a source) downward flux fraction[of a source] downward flux [of a source] downward flux[of a source] downward force downward illumination downward inclination downward light output ratio downward light output ratio (of a luminaire) downward light output ratio [of a luminaire] downward line downwardly downwardly mobile downward mobility