英语词汇“penumbra”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	penumbra
释义	penumbra —penumbral, penumbrous, adj. /pi num"breuh/, n. , pl. penumbrae /-bree/, penumbras. 1. Astron. a. the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off. Cf. umbra (def. 3a). b. the grayish marginal portion of a sunspot. Cf. umbra (def. 3b). 2. a shadowy, indefinite, or marginal area. [1660-70; < NL, equiv. to L paen- PEN- + umbra shade]
随便看	Thurston thus thusly Thus Spake Zarathustra Thutmose I Thutmose II Thutmose III thuya thwack thwart Thwing thy Thyatira Thyestes thylacine thylakoid thyme thymectomy -thymia thymic thymidine thymine thymocyte thymol thymosin

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