闰年每四年一次，在闰年的那一年，二月份只有29天。

Leap year recurs every four years, and in that year February have 29days.

youdao

闰年每四年一次，在闰年的那一年，二月份只有29天。

Leap year recurs every four years, and in that year February have 29days.

youdao