名词
中文翻译：闰年
同义词：
['leap year', 'extra year']
例句：
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1. The calendar is set to observe the Gregorian calendar for the next two years.
日历将在接下来的两年里使用格里高利历。
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2. This year is a leap year because it falls on an uneven number of days.
今年是闰年，因为它的天数不是整数。
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3. The ancient Egyptians used to celebrate their new moon festival in a leap year.
古埃及人会在闰年庆祝他们的新月节。