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 | θ81001 |
| 释义 | the world > matter > light > darkness or absence of light > intercepting or cutting off of light > [noun] > casting of a shadow > a shadow > partial (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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