以彗星尾长作为DNA损伤程度的评价指标。
库克介绍木星的巨大的引力持续的影响彗星尾迹。
Jupiter's large gravitational pull is constantly influencing the meteor streams, according to Dr. Cooke.
采用这种战略，大量由于不具有彗星尾而经过化学手腕引入彗星尾的控制细胞，就能得到更稳定的评价。
Using this criterion , many control cells have no comet tails thereby enabling chemically induced tails to be more readily assessed.
观测到一个强测试反响，产生一个一定长度的彗星尾。在有生机的或者死亡的控制细胞都没有观测到DNA内容。
A strong positive test response was observed producing comet tails of a length and DNA content not observed in either viable or dead control cells.
内皮尔教授的理论认为，当地球进入一颗大彗星脱落的密集的尾状碎片带时，那次灾难性的毁灭就发生了。
Professor Napier's theory suggests the devastation took place when the Earth strayed into a dense trail of fragments shed by a large comet.
海尔波普彗星在位于海王星轨道上方出现，因其与太阳之间距离足够远，所以并未出现脏尾。-约翰·迈特森报道。
Comet Hale-Bopp has been spotted beyond the orbit of Neptune, far enough from the sun to be without its dirty tail. John Matson reports.
来自彗星的微小粒子被太阳辐射压向后推斥，形成尘埃尾。
Dust tails are created when small particles from a comet are swept backward by the Sun's radiation pressure.
从Johnson彗星的彗核（照片中部的黄色球体）向上延展的扇状区域描绘出了这颗彗星的尘埃“尾”。
The fan-shaped region that stretches upward from Johnson's nucleus (yellow ball in the middle) represents the dust "tail" of the comet.
海尔·波普彗星在位于海王星轨道上方出现，因其与太阳之间距离足够远，所以并未出现脏尾。
Comet Hale -bopp has been spotted beyond the orbit of Neptune, far enough from the sun to be without its dirty tail. John Matson reports.
海尔·波普彗星在位于海王星轨道上方出现，因其与太阳之间距离足够远，所以并未出现脏尾。
Comet Hale -bopp has been spotted beyond the orbit of Neptune, far enough from the sun to be without its dirty tail. John Matson reports.
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