umbral 的定义
- of or like a shadow or shadowy apparition:Smoke was rising and beginning to coat the clouds a deep, umbral black.In an instant the vampire’s corporeal form dematerialized into an umbral form that quickly merged with the surrounding cover of night.
- Astronomy. relating to or being the complete shadow of an opaque body, such as a planet, where all direct light from the source of illumination is cut off:It was to be a very deep eclipse, with the moon passing very close to the center of Earth's umbral shadow.Compare penumbral 1a. relating to or being the dark central portion of a sunspot:Umbral flashes—powerful brightenings that shock the darkest part of the sunspot—appear continuously every 2 to 3 minutes.Compare penumbral 1b.
umbral 近义词
等同于 shadowy
更多umbral例句
- Outside the umbral cone is that of the penumbra, within which the sun is partially hidden by the moon.
- Rosario entraba una llave en la invisible cerradura, y abra cuidadosamente la 115 puerta en cuyo umbral se haban sentado.