mean distance
英
美
- 平均距离
详细释义
Noun:
-
the arithmetic mean of the maximum and minimum distances of a celestial body (satellite or secondary star) from its primary
双语例句
- A unit of length used for distances within the solar system,equal to the mean distance between the Earth and the Sun.
用来计算太阳系内距离的单位，等于地球到太阳的平均距离。
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