The partially shaded region around the shadow of an opaque body, when the light source is larger than a point source and only part of its light is…
| 单词 | θ919 |
| 释义 | the world > the universe > sun > sunlight > [noun] > eclipse > penumbra (1) penumbra1665 The partially shaded region around the shadow of an opaque body, when the light source is larger than a point source and only part of its light is… |
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