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单词 astronomical unit
释义 astronomical unitn. a unit of measurement in astronomy equal to the mean distance from the centre of the earth to the centre of the sun, 1.496 × 1011 metres or 92.9 million miles 天文单位(地球与太阳间的平均距离,约为 9,290 万英里)
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更新时间:2025/2/11 16:40:09