plain 也可以當形容詞使用，用來表示＂樸素的、樸實的、簡樸的、純樸的＂等意思，例如英文的 plain chocolate 就是指純巧克力。
另外有一個英文單字 field（聽發音）本身是＂田、場、域＂等意思，有時候在口語上也會用 field 這個單字來描述眼前的一片平原。
平原英文造句練習
I really want lying on the plain to watch stars every day.我真想每天都躺在平原上看星星。
Taiwan's largest plain is Jianan Plain.
台灣最大的平原是嘉南平原。
This picture show the running horses on the plain.
這張照片顯示在平原的奔馬。
Grandmother look Tom running on the plain, really happy.
奶奶看湯姆平原上跑，真的很開心。
I worked hard every day, really want to relax on the plain.
我每天都在努力工作，真想在平原上放鬆一下。
Outside of Mary's window has a large green plain.
瑪莉的窗外有一大片綠油油的平原。
This hotel's selling point is a large plain.
這間飯店的賣點是一大片的平原。
On the plain covered with small yellow flowers, really beautiful.
這片平原上開滿了小黃花，真美麗。