| 释义 |
umbraBrE /ˈʌmbrə/ NAmE /ˈʌmbrə/ noun (plural um·bras or um·braeBrE /ˈʌmbriː/ NAmE /ˈʌmbriː/ ) (specialist ) the darkest part of a shadow 本影（影子中光源完全照射不到的部分）the area on the earth or the moon which is the darkest during an eclipse（日食或月食期间地球或月球的）本影 ➡ compare penumbra |