It becomes visible to the naked eye every 76 years when it nears the sun.
它每隔76年靠近太阳时，变得肉眼可见。
Battalion commander of the duty officer said: "tomorrow evening about eight o 'clock, Halley's comet will be in the area to see the comet can be seen once every 76 years."
营长对值班军官说：“明晚大约八点钟，哈雷彗星将可能在这个地区看到，这颗彗星每隔76年才能看见一次。”
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。
Platoon leader to the squad leader, said: "8 o 'clock tomorrow night, a battalion commander with Halley's Comet will appear in the auditorium, which is only once every 76 years thing."
排长对班长说：“明晚8点，营长将带着哈雷彗星在礼堂中出现，这是每隔76年才有的事。”
Platoon leader to the squad leader, said: "8 o 'clock tomorrow night, a battalion commander with Halley's Comet will appear in the auditorium, which is only once every 76 years thing."
排长对班长说：“明晚8点，营长将带着哈雷彗星在礼堂中出现，这是每隔76年才有的事。”
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