1、A leap year has 366 days
閏年有366天。

2、Feb. 29 is an intercalary day; leap year is an intercalary year.
2月29日是閏日；閏年是有添加日的年份。

3、The leap year comes around once in four years.
閏年每四年來一次[每四年有一個(gè)閏年]。

4、The two most people encounter are leap year and daylight savings time.
人們最常遇到的兩種情況是閏年和夏令時(shí)。

5、Each leap year we add that day onto the end of February.
每個(gè)閏年我們都要在二月底加上一天。