penumbra
US /pɪˈnʌm.brə/
UK /pɪˈnʌm.brə/
名詞
1.
半影
a part of a shadow in which only some of the light is blocked, used especially about a shadow made during an eclipse:
例:
•
In a lunar eclipse, the outer shadow or penumbra is a zone where Earth blocks a portion of the sun's rays.
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