哈雷彗星每隔76年才会在地球上可见一次。
Halley's ___comet becomes visible from Earth only once every 76 years.
科学家们正在研究这颗彗星的尾巴，以了解太阳系的起源。
Scientists are studying the tail of this ___comet to learn about the origin of the solar system.
他的才华犹如一颗转瞬即逝的流星，耀眼却短暂。
His talent was like a ___comet — brilliant but fleeting.
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