曲線的低點：那段時間，與那段時間的價錢
兩個意思站在同一個低點上，差別只在後面接什麼名詞：接時間就是在講人少，接東西就是在講便宜。
adjective · B2
Off-peak hours, periods or seasons are the ones when fewer people want to do or use something, so it is less busy then.
離峰時段的
核心畫面
Draw the day as a curve of how many people are using something — trains, phone lines, a swimming pool. The top of the curve is the peak, and off means away from the top, so the word can be thought of as pointing at the low, flat part of the line. Standing down there, you can look at two things. One is the quiet stretch of time itself. The other is the cheaper ticket that is sold for standing there.
可以想成把一天的使用量畫成一條曲線：搭車的人、打電話的人、去游泳池的人。最高的那一段是 peak，尖峰；off- 表…更多收起
可以想成把一天的使用量畫成一條曲線：搭車的人、打電話的人、去游泳池的人。最高的那一段是 peak，尖峰；off- 表示離開那個高點，所以這個詞指的是曲線低平的那一段。站在那個低點上，可以看到兩樣東西：一個是那段人很少的時間本身，另一個是為了那段時間賣得比較便宜的票或電。One branch