Leap year recurs every four years.
每四年闰年一次。
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。
Every four years a leap day helped keep things on track.
四年一闰，闰年于二月底增加一闰日以保证万物步入正轨。
Every four years a leap day helped keep things on track.
四年一闰，闰年于二月底增加一闰日以保证万物步入正轨。
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