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。
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。
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。
Only two countries, Thailand and Togo, made a clear leap forward last year, going from “not free” to “partly free”.
只有泰国和多哥去年取得了明显进步，从“不自由”国家变成了“有一定自由”国家。
But one challenge for Apple's sales this year is that its most recent models do not represent a big leap from the previous generation.
但今年苹果在销售方面面临着一个挑战：它最新推出的机型与上一款相比并没有特别大的进步。
If you were born in a leap year, you may not get to celebrate your birthday every year.
如果你是润年出生，你有可能不会每年都庆祝到生日。
If you were born in a leap year, you may not get to celebrate your birthday every year.
如果你是润年出生，你有可能不会每年都庆祝到生日。
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