| 单词 | spiral arm |
| 释义 | > as lemmasspiral arm spiral arm n. an arm of a spiral galaxy. ΘΚΠ the world > the universe > constellation > galaxy > [noun] > spiral galaxy > arm of spiral arm1914 1914 A. S. Eddington Stellar Movements xi. 243 The star clouds of the Milky Way form its [sc. our galaxy's] spiral arms. 1978 J. M. Pasachoff & M. L. Kutner University Astron. xxiii. 582 The interstellar extinction prevents us from studying parts of the spiral arms farther away from the sun. < as lemmas |
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