名詞 penumbra:

1. a fringe region of partial shadow around an umbra

pe.num.bra

n.（名詞）
【復(fù)數(shù)】 pe.num.brae[-brô] 或 pe.num.bras
A partial shadow, as in an eclipse, between regions of complete shadow and complete illumination.See Synonyms at shade
半影：在完全陰影和完全照明區(qū)之間被部分遮擋的陰影，如在月蝕中參見 shade
The grayish outer part of a sunspot.
太陽(yáng)黑子周圍較濃的淺灰區(qū)
An area in which something exists to a lesser or an uncertain degree:
邊緣：某物在其中以較弱或不確定程度存在的區(qū)域：
例句：
.The First Amendment has a penumbra where privacy is protected from governmental intrusion.(Joseph A. Califano, Jr.)
.第一修正案在個(gè)人隱私不受政府侵犯方面較為模糊.(小約瑟夫A.卡里法諾)

An outlying, surrounding region; a periphery:
外部、邊緣區(qū)域；外圍：
例句：
.Downtown Chicago and its penumbra also stand rejuvenated.(John McCormick)
.芝加哥城商業(yè)中心及其周邊地區(qū)都恢復(fù)了生機(jī).(約翰·麥考密克)

來源：
New Latin
現(xiàn)代拉丁語(yǔ)
Latin paene [almost]
拉丁語(yǔ) paene [幾乎]
Latin umbra [shadow]
拉丁語(yǔ) umbra [陰影]

【引伸】
penum.bral 或
penum.brous
adj.（形容詞）