单词 | nebula |
释义 | nebula n. (pl. nebulae or nebulas) 1. Astron. a a cloud of gas and dust, sometimes glowing and sometimes appearing as a dark silhouette against other glowing matter. b a bright area caused by a galaxy, or a large cloud of distant stars. 2. Med. a clouded spot on the cornea causing defective vision. Etymology: L, = mist |
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