New Words：

plain [plein]
n.平原
adj.清楚的；简单的；坦白的；平常的；朴素的；纯的

Sample Sentences：

She always wears plain clothes to work.
The meaning of the sentence is very plain.
To be plain with you, I know nothing about it.
When we reached the top of the mountain, a wide plain came into view.

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