| 释义 |
海王星hǎiwángxīng太阳系九大行星之一,按离太阳由近而远的次序计为第八颗,绕太阳公转周期约164.8年,自转周期约22小时。光度较弱,肉眼看不见。{Neptune; the 8th in order from the sun among the nine planets of our solar system, with an orbital cycle of 164.8 years around the sun and a rotation period of 22 hours, invisible to the naked eye for its relatively weak luminosity;} |