每日口說挑戰 我們為什麼打哈欠? (Why Do We Yawn?)

今日挑戰句子

These cycles take about 90 minutes each, and you feel most refreshed if you wake up at the end of the cycle, because by then, you are closest to your normal waking state.

一個週期大概是 90 分鐘，而如果在週期的最後醒來的話，最能消除疲憊，因為那是最接近自然醒的狀態。