in the Gregorian calendar: any year divisible by 4 except centenary years divisible by 400 同义词：intercalary year, 366 days, bissextile year,
A leap year (or intercalary or bissextile year) is a year containing one additional day (or, in the case of lunisolar calendars, a month) in order to keep the calendar year synchronized with the astronomical or seasonal year.Meeus, Jean.
例句与用法
1.
In leap years there are 366 days . 在闰年有366天。
2.
All years that are divisible by 4 should be leap years of 366 days, except those which coincide with the beginning of a century . 除了世纪开始的年份外，所有被四整除的年份应是由366天构成的闰年。
3.
Determines whether the specified year is a leap year 确定指定的年份是否为闰年。
4.
Leap year is the year when february has 29 days 二月里有29天的月份是闫年。
5.
A common year has 354 days and a leap year has 355 days 平年有354天，闰年有355天。
6.
The leap year comes around once in four years 闰年每四年来一次[每四年有一个闰年] 。
7.
A common year has 365 days and a leap year has 366 days 平年有365天，闰年有366天。
8.
A leap year can have from 383 to 385 days 闰年可能有383到385天。
9.
Returns an indication whether the specified year is a leap year 返回指定的年份是否为闰年的指示。
10.
February has 29 days during leap years and 28 during common years 2月在闰年中为29天，在平年中为28天。
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