| 释义 |
umbra/ˈʌmbrə ||; ˈʌmbrə/noun [c] (technical术语) 1. the central part of a shadow where it is completely dark （阴影的）本影，全影 2. a completely dark area on the earth caused by the moon, or a completely dark area on the moon caused by the earth, during an eclipse (= a time when the moon is between the earth and the sun, or when the earth is between the moon and the sun) （日食或月食时的）本影 ☞compare penumbra. 与penumbra比较。 ☞picture at shadow 见shadow插图 |