闰年;
Leap year recurs every four years.
每四年闰年一次。
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。
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]。
This time was added as an extra day during each leap year.
在每个闰年里,这些时间就被加总起来成为多出来的一天。
It also introduces the concept of the leap year to students in an interesting way.
它也用有趣的方式,将闰年的概念介绍给学生。
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