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单词 Halley's comet
释义
Hal·ley's comet (hălēz, hālēz)
n.
A comet with a period of approximately 76 years. The first comet for which a return to the inner solar system was accurately predicted, it last appeared in 1986.

[After Edmund Halley.]
Halley's comet
photographed in February 1986
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更新时间:2025/2/23 6:38:28