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单词
mean distance
释义
WordReference Random House Unabridged Dictionary of American English © 2024
mean
′
dis
′
tance,
[
Astron.
]
Astronomy
the arithmetic mean of the greatest and least distances of a planet from the sun, used in stating the size of an orbit;
the semimajor axis.
1885–90
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更新时间:2026/3/22 21:09:31