perihelion

常見例句

用作名詞 (n.)

• A comet is at perihelion when it is closest to the sun.
  彗星最接近太陽時，它就是在近日點(diǎn)。
• The anomalistic year is the time between successive transits of the Earth through the perihelion.
  近點(diǎn)年是地球連續(xù)兩次通過近日點(diǎn)之間的時間。
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