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英语
西班牙语
penumbra <pl penumbras or penumbrae [-briː]> [美 pəˈnəmbrə, 英 pɪˈnʌmbrə] 名词
- penumbra
- penumbra f
西班牙语
英语
- penumbra
- penumbra
在《PONS词典》中的词汇
- penumbra 天文
- penumbra
在《PONS词典》中的词汇
- penumbra 天文
- penumbra
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单语范例（未经PONS编辑处理）
If two penumbras overlap, the shadows appear to attract and merge.
en.wikipedia.org There was, however, a penumbra relating to money payments in which imprisonment could be used in appropriately defined circumstances.
en.wikipedia.org An alternative definition is that the penumbra is the region where "some or all" of the light source is obscured (i.e., the umbra is a subset of the penumbra).
en.wikipedia.org Observing the variation in width of the penumbra of a sunspot near the limb, he concluded the sunspots were depressions in the generally spherical photosphere.
en.wikipedia.org It is believed that mitochondria play an essential role in the metabolism of astrocyte energy within the penumbra of ischemic lesions.
en.wikipedia.org