Chinese

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Mars; to be outdated and unaware; to not know something that everyone else knows
day; sun; date
day; sun; date; day of the month; Japan (abbrev.)
 
trad. (火星日) 火星
simp. #(火星日) 火星
 
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Noun

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火星日

  1. (astronomy) sol (a solar day on the planet Mars,equivalent to 24 hours, 39 minutes, 35 seconds)