形容词
中文翻译：Unknown
同义词：
['simple', 'unadorned', 'plain-looking']
例句：
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1. The plain design of the dress is very popular among young people.
这件连衣裙的简单设计非常受年轻人欢迎。
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2. The plain house looks more like a warehouse than a home.
这间朴素的房子看起来更像是仓库，而不是家。
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3. The plain man's voice was so deep that it could be heard from a distance.
那个朴素男人的声音深沉到可以从远处听到。