历年( calendar year的名词复数 );
Julius Caesar introduced Leap Years around 45BCE by adding one day to the last month of the calendar year, February.
公元前458年,凯撒引进了闰年的概念,在一年的最后一个月加上一天,也就是在二月加上一天。
Leap years are necessary to keep our calendar in alignment with the Earths revolutions around the sun.
闰年是对地球绕太阳运转所需时间和公历时间之差所作的调整。
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