plan·e·tar·y
adjective/ˈplænətri/
/ˈplænəteri/
[only before noun] (specialist)- relating to a planet or planets
行星的 - planetary activity
行星活动 - a planetary system
行星系
Oxford Collocations DictionaryPlanetary is used with these nouns:- mission
- orbit
Word Originlate 16th cent.: from late Latin planetarius ‘relating to the planets’ (recorded only as a noun meaning ‘astrologer’), from planeta ‘planet’. - planetary activity