名词
中文翻译：闰年
同义词：
['leap year', 'leap year']
例句：
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1.The calendar is set for a synodic year in 2024.
日历被设定为2024年的闰年。
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2. This year's synodic year has been celebrated with extra days off.
今年的闰年被庆祝了额外的假期。
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3.The synodic year is an important factor in determining the length of the year.
闰年是决定一年长度的一个重要因素。