| 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 cometphotographed in February 1986 |
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