solar system太阳系;
Mercury水星;
Venus金星;
Earth地球;
Mars火星;
Jupiter木星;
Saturn土星;
Uranus天王星;
Neptune海王星;
Pluto冥王星;
planet行星;
orbit轨道;
North Pole北极;
South Pole南极;
Northern hemisphere北半球;
equator赤道;
longtitude经度;
latitude纬度
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