每日口說挑戰 四年一度的 2 月 29 日？閏年到底是什麼？ (Why Do We Have Leap Years?)

今日挑戰句子

The main issue is that the Earth's orbit and its rotation don't have anything to do with each other.

主要的問題在於地球公轉與自轉兩者之間沒有關係。