n.彗星，扫帚星

原形：comet复数：comets

A comet moves around the Mark like planets.
彗星像行星一样绕火星运转。
Eric has been studying a comet for more than 20 years.
埃里克已研究彗星长达20余年。
A comet streaked across the night sky, leaving a trail of light behind it.
一颗彗星划过夜空，留下一道光轨。
The comet Hale-Bopp was visible to the naked eye for several weeks in 1997.
哈雷彗星在1997年肉眼可见了好几个星期。
The approach of Halley's Comet is an event that occurs only once every 76 years.
哈雷彗星的接近是一个每76年才发生一次的事件。
Astronomers have discovered a new comet that will make its closest approach to Earth next year.
天文学家发现了一颗新的彗星，它将在明年最接近地球。
The comet's tail pointed towards the sun, indicating its direction of travel.
彗星的尾巴指向太阳，指示出它的行进方向。
The ancient Egyptians recorded the appearance of comets in their hieroglyphics.
古埃及人在他们的象形文字中记录了彗星的出现。
The comet's nucleus is believed to be composed of ice, dust, and rocky material.
人们认为彗星的核心由冰、尘埃和岩石物质组成。
As the comet draws closer to the sun, its coma becomes more prominent.
彗星越靠近太阳，其彗发就越明显。
The brightness of a comet can vary greatly depending on its distance from the Earth and the Sun.
彗星的亮度会因其与地球和太阳的距离而大大变化。
Many people believe that comets are harbingers of significant events or changes.
许多人相信彗星是重大事件或变革的预兆。