为什么要有闰年？
原来1900不是闰年。
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]。
How often is there a leap year?
隔多长时间有一次闰年？
That's how leap year got its name.
那就是闰年名字得来的原因。
Which year were you born? Is it the leap year?
你出生在哪年，是闰年吗？
Determines whether the specified year is a leap year.
确定指定的年份是否为闰年。
Each leap year we add that day onto the end of February.
每个闰年我们都要在二月底加上一天。
Feb. 29 is an intercalary day; leap year is an intercalary year.
2月29日是闰日；闰年是有添加日的年份。
The extra day in February because of the leap year also helped, specialists said.
专家表示，因今年是闰年，2月比往年多了1天，这也是有利因素之一。
And twenty-nine on each Leap Year.
每个闰年二月有二十九天。
Leap year recurs every four years.
每四年闰年一次。
Leap year recurs every four years.
每四年闰年一次。
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