| 单词 | 星云状 |
| 释义 | 〔comet〕A celestial body, observed only in that part of its orbit that is relatively close to the sun, having a head consisting of a solid nucleus surrounded by a nebulous coma up to 2.4 million kilometers (1.5 million miles) in diameter and an elongated, curved vapor tail arising from the coma when sufficiently close to the sun. Comets are thought to consist chiefly of ammonia, methane, carbon dioxide, and water.彗星：一种天体，仅能在它比较接近于太阳的那一部分轨道才能看到，有一个包括固体核、由直径达到两千四百万公里（一千五百万英里）的星云状的彗发围绕的头部 ，当足够接近太阳时一个拉长的曲线气尾从彗发升起。人们认为彗星主要有氨、甲烷、二氧化碳和水构成 |
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