单词 | 太阳时 |
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〔year〕The period of time during which the earth completes a single revolution around the sun, consisting of 365 days, 5 hours, 49 minutes, and 12 seconds of mean solar time. In the Gregorian calendar the year begins on January 1 and ends on December 31 and is divided into 12 months, 52 weeks, and 365 or 366 days. Also called calendar year 年:地球完成围绕太阳运转一周的时段,由365天、5小时、49分和12秒组成的平均太阳时,根据格里高利历,一年开始于1月1日结束于12月31日,被分成12个月、52个星期、365天或366天 也作 calendar year |
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