科研之友
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<正>The word "moon" has been around as long as the English language, which is not surprising because the moon was critically important to early civilizations. It comes from the Old English "mona" and shares a root with the word "month"——because the moon revolves around the Earth once a month. While the sun stays the same day after day, the moon changes every night, allowing ancient people to identify the days and months and seasons.
