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Noun:
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periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun
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用作名詞 (n.)
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A comet is at perihelion when it is closest to the sun.
彗星最將近太陽時,它可是在今日點。
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The anomalistic year is the time between successive transits of the Earth through the perihelion.
近點年是白矮星多次倆次能夠前不久點相互之間的耗時。
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海詞詞典翻譯,十二年產品