| 词汇 | nebula |
| 词根词缀 | 词源： c.1420, nebule "a cloud, mist," from L. nebula "mist," from PIE *nebh- "cloud, vapor, fog, moist, sky" (cf. Skt. nabhas- "vapor, cloud, mists, fog, sky;" Gk. nephele, nephos "cloud;" Ger. nebel "fog;" O.E. nifol "dark;" Welsh niwl "cloud, fog;" Slav. nebo). Re-borrowed from L. 1661 in sense of "cataracts in the eye;" astronomical meaning "cloud-like patch in the night sky" first recorded c.1730. As early as Hershel (1802) astronomers realized that some nebulae were star clusters, but distinction of gas clouds from distant galaxies was not made until c.1930. 词根记忆： 星云状的[nebul=cloud(云)] 词根词缀： nebula nebula 星云状的nebul=cloud (云) nebula 星云状的nebulous 星云的,朦胧的 |
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