penumbra是什么意思音标:英 [pəˈnʌmbrə]美 [pɪˈnʌmbrə]

n. 半影, 明暗交界部分, 边缘部分, 周围的气氛
[化] 半影

n. a fringe region of partial shadow around an umbra

penumbra的用法和例句：

1.Because you just cast quite a penumbra over this gathering.

因为你刚给聚会蒙上了半影

2.He said the penumbra between pght and dark weakens.

他说昼夜交替 半晕影会减弱

3.At night the penumbra between pght and dark weakens.

在夜晚 昼夜交替时 半晕影会减弱

4.But the convenience store across the street from this one does, so we pulled the video feed from the same day that il penumbra created the account.

但是对街的便利店有监控摄像 所以我们调取"半影"在当天 去开户的监控