plains 是 plain 的第三人稱單數、複數

plain

KK [plen] /pleɪn/

形容詞

1
清楚的、明白的、顯而易見的
It was plain to everyone that she had been crying.
大家都看得出來她剛剛哭過。
2
樸素的、簡單的、不花俏的
They served plain food, but everything tasted fresh.
他們端出來的是家常菜，但每一樣都很新鮮。
3
素色的、無圖案的
I prefer a plain shirt to one with stripes.
我比較喜歡素色襯衫，不喜歡有條紋的。
4
直率的、坦白的、不客氣的
Let me be plain with you about the risks involved.
關於其中的風險，我就跟你直說了。
5
純粹的、十足的、完全的強調用法
Ignoring the warning signs was plain stupidity.
無視那些警告標示簡直就是愚蠢。
6
不好看的、長相平庸的委婉
She described herself as a plain but confident woman.
她形容自己是個長相普通但很有自信的女人。
7
平坦的
The road ran across the plain, dry countryside.
那條路橫越乾燥平坦的鄉間。

1
平原、平地常用複數
Herds of wild horses still roam these northern plains.
成群的野馬仍在這片北方平原上奔馳。

1
簡直、完全、根本口語
His answer was just plain wrong, and everyone knew it.
他的答案根本就是錯的，大家心裡都清楚。