1. The moon waxes and wanes every month. 
   月亮在每个月有盈有亏。
2. The day of the new moon and the first day of the month in the ancient Roman calendar. 
   朔新月的日子以及古罗马日历中每月的第一天
3. Once a month, or more exactly, once every 29 1/3 days, at the time we call "full moon" its whole disc looks bright. 
   每月一次，或者更确切地说，每29.5天一次，我们称它为“满月”，此时，整个月亮看起来是明亮的。
4. Mid-Autumn Festival falls on the 15th day of the 8th month, it is the time when the moon is said to be at its brightest and fullest. 
   每年农历8月15日人们一起庆祝中秋，据说这一天的月亮是一年中最亮最圆的。
5. geology of the Moon 
   月球地质

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