a celestial body moving in an elliptical orbit round a star
行星。
(
地球
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no generation has the right to pollute the planet .任何一代人都无权污染地球。
【主占星】 〈主史〉 命运星辰。
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what planet are you on ?Brit. informal used to indicate that someone is out of touch with reality〈英, 非正式〉 [用以表示某人脱离了现实] 你在哪颗行星上?
"Middle English: from Old French