I have written a program to determine whether a year (such as 1900) is a leap year, is the show in 1900 as a leap year, otherwise show that 1900 was not a leap year.

自己编写一段程序判断一个年份(比如1900年)是否是闰年，是则显示1900年为闰年，否则显示1900年不是闰年。

youdao

The reason for a leap day or a leap year is because our calendar does not follow the Earth's orbit around the sun exactly.

闰日或闰年出现的原因是我们的历法并不精确地遵循地球围绕太阳运行的轨道。

youdao

For example, the year 2000 was a leap year, but the year 1900 was not, because when divided by 400, it does not render a whole number.

比如，2000年是闰年，但是1900年不是。因为1900不能被400整除。

youdao

Lawyers and other professionals will bill added hours on Feb. 29 although not all need a leap year for that.

WSJ: For Some, All in a Leap Day's Work

The event has helped make 2008 a pivotal year for China--just in ways not fully foreseen, even by those who appreciated the leap of hosting a noisy world party in a society that is still closed in important ways.

FORBES: Getting to Yes