February 29 is called a leap day.

2月29日被称为闰日。

I literally leap out of bed every day because I'm so excited about getting to work.

我每天早晨真的都是欢欣雀跃地起床的，因为我想到要去工作就超开心。

Leap years were believed to be difficult, and leap days unlucky and a bad time to begin anything new.

闰年被认为是很艰难的一年， 而闰日是不吉利的，不是开始新事物的好时机。

The Romans were the ones who first decided that February 29th should be the extra day, known as a leap day.

罗马人首先决定将 2 月 29 日作为额外的一天，即闰日。

The reason for a leap day or a leap year is because our calendar does not follow the Earth's orbit around the sun exactly.

闰日或闰年之所以出现，是因为我们的日历并不完全按照地球绕太阳的轨道运行。

And since a tropical year is a tad longer than 365 days, Julius added a leap day every four years, except they inserted it after February 23, right in the middle of the month.

但，因为，回归年并不是正好365天，而是365.242天。Julius每隔4年，加一天，除了要加在2月23日的后面，还要在2月的中间日。