一颗彗星划过夜空。
A ___comet streaks across the night sky.
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.
他的才华如同彗星般闪耀却短暂。
His talent was like a ___comet — dazzling but short-lived.
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