形容词
中文翻译：简单的
同义词：
['simple', 'straightforward', 'unadorned']
例句：
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1. The plain design of the dress is very popular among young women.
这件衣服简单的设计非常受年轻女性欢迎。
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2. The plain truth was that he had no money.
事实很简单，他没钱。
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3. The plain facts are that we need to find a new solution.
简单的事实是我们需要找到一个新解决方案。