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单词 Halley's comet
释义

Halley's comet

A periodical comet with an orbital period of about 76 years, its reappearance in 1758-9 having been predicted by Edmond Halley. It was first recorded in 240 bc and last appeared, rather faintly, in 1985-6.
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更新时间:2024/9/23 21:30:58