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ADJ
單色的；素色的；無花紋（或圖案、字跡）的
A plain object, surface, or fabric is entirely in one colour and has no pattern, design, or writing on it.
例句
In general, a plain carpet makes a room look bigger...
一般來說，單色的地毯使房間顯得更寬敞。
He placed the paper in a plain envelope...
他把論文裝進一個空白信封里。
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ADJ-GRADED
樸素的；簡樸的
Something that is plain is very simple in style.
例句
Bronwen's dress was plain but it hung well on her...
布朗溫的長裙雖然樸素，卻很合身。
It was a plain, grey stone house, distinguished mainly by its largely unspoilt simplicity.
這是一幢簡樸的灰石房子，主要以其天然簡約的風格顯得與眾不同。
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ADJ-GRADED
明顯的；明白的；清楚的
If a fact, situation, or statement is plain, it is easy to recognize or understand.
例句
It was plain to him that I was having a nervous breakdown...
他能明顯地看出我快要精神崩潰了。
He's made it plain that he loves the game and wants to be involved still.
他明確表示自己熱愛這項運動，并仍想參與其中。
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ADJ-GRADED
（相貌）平常的，不好看的
If you describe someone as plain, you think they look ordinary and not at all beautiful.
例句
...a shy, rather plain girl with a pale complexion.
膚色蒼白、相貌平平的害羞女孩
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N-COUNT
平原；（幾乎沒有樹木的）大片平地
A plain is a large flat area of land with very few trees on it.
例句
Once there were 70 million buffalo on the plains.
北美大平原上曾有過7,000萬頭野牛。
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ADV
（用于形容詞前加強語氣）顯然，完全地
You can use plain before an adjective in order to emphasize it.
例句
The food was just plain terrible.
這食物實在太難吃了。
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ADJ
（尤在與另一個更加不同尋常或讓人印象深刻的名字比較時表示強調）普通的，平凡的
You can use plain before a name to emphasize how simple and ordinary it is, especially when you are comparing it with another more unusual or impressive name.
例句
Why couldn't they call you plain Ann or Alice like the rest?
他們為什么不能像其他人一樣，給你取個普普通通的安或艾麗斯的名字呢？
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PHRASE
（警察）穿便衣的
If a police officer is in plain clothes, he or she is wearing ordinary clothes instead of a police uniform.
例句
Three officers in plain clothes told me to get out of the car.
3名便衣警察讓我下車。