形容词
中文翻译：简单的
同义词：
['simple', 'unadorned']
例句：
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1. The plain design of the dress is very appealing to me.
这件衣服简单大方的设计很吸引我。
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2. The plain truth is that we need to work together for a better future.
事实就是我们需要共同努力，创造一个更好的未来。
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3. She wore a plain black dress to the party.
她穿着一件朴素的黑色连衣裙去参加派对。