名词
中文翻译：闰年
同义词：
['leap-year', 'leap year']
例句：
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1.The calendar has a leap year every four years.
日历每隔四年有一个闰年。
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2.This year is a leap year because it's an even number of days.
今年是闰年，因为天数是偶数。
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3.In the past, people used to celebrate the leap year with extra holidays.
过去人们会用额外的假期庆祝闰年。