n. (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit
n. 彗星
1. A comet can be seen in the night sky when it passes close to Earth.
当彗星靠近地球时，可以在夜空中看到它。
2. The famous Halley's Comet appears every 76 years.
著名的哈雷彗星每76年出现一次。
3. Scientists study comets to learn more about the solar system's formation.
科学家研究彗星以了解更多关于太阳系形成的信息。