以下为句子列表：
英文: The method of fitting leads to the following results: the first shell (innermost one), deriving from a jet formation, is seen as an Archimedes spiral and the velocity of the ejecta from the cometary nucleus is .km/s ;
中文: 对测量的数据用优选法分析后给出 : 从彗核喷发出的喷流 (壳层结构的第一层亦即最靠近彗核的那一层 )呈阿基米德螺线形状 ,喷流喷出物质的速度 (thevelocityoftheejecta).km/s;
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