Is not a leap year的意思|示意

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。

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。