Halley's comet, which reappears about every 75 years, is a 'short-period' comet from a different part of the Solar System called the Kuiper Belt.

哈雷彗星大约每75年会再现一次，哈雷彗星是一个“短期”的彗星，来自太阳系一个名为柯伊伯带的与众不同的部位。

youdao

The red circle is the orbit of a long period object like a comet. Note the object and its tail.

红色的圈是一个类似彗星的长周期天体的轨道，注意一下这个天体和它的尾巴。

youdao

A comet with an orbital period of less than 200 years is called a "periodic comet", of which the best known is probably Halley's comet, which orbits the Sun every 76 years.

有着一个少于200年的轨道周期的彗星被称作“周期彗星”，其中最著名的可能要数哈雷彗星，它每76年围绕太阳运转一圈。

youdao

The Curry's and PC World owner is due to unveil sales data from the Christmas period, when rival Comet collapsed.

BBC: French Connection and Thorntons down on trading reports

Deep Impact has now set its sights on comet Ison during a 36-hour period in mid-January.

BBC: Comet Ison caught on film by Deep Impact craft

That would give it an orbital period of 341 years the longest yet measured and far longer than, for example, comet Halley, which goes around the sun in a sprightly 76 years.

ECONOMIST: Comet Ikeya-Zhang is enlivening the skies