| 单词 | aphelion |
| 释义 | Word Frequency aphelion(æpˈhiːlɪən, əˈfiː-) nounWord forms: plural -lia (-lɪə) the point in its orbit when a planet or comet is at its greatest distance from the sun Compare perihelion Derived forms aphelian (apˈhelian) adjective Word origin C17: from New Latin aphēlium (with pseudo-Greek ending -ion) from ap- + Greek hēlios sun |
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