| 单词 | penumbra |
| 释义 | penumbra/pəˈnʌmbrə ||; pɪˈnʌmbrə/noun [c] (technical术语) 1. the outer part of a shadow, that is less dark than the central part 半阴影 2. a dark area on the earth caused by the moon, or a dark area on the moon caused by the earth, during a partial eclipse (= a time when the moon is almost exactly between the earth and the sun, or when the earth is almost exactly between the moon and the sun) （偏食时月亮投在地球或地球投在月亮上的）半影 ☞compare umbra. 与umbra比较。 ☞picture at shadow 见shadow插图 |
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