plain coreopsis

例句：

1. 1. The plain clothes made him look more professional.
   朴素的衣服让他看起来更专业。
2. 2. The plain design of the dress is very popular among young women.
   这件裙子的简单设计非常受年轻女性欢迎。
3. 3. The plain tablecloth was a welcome change from the elaborate dinner service.
   朴素的桌布是与精致的晚餐服务形成鲜明对比的欢迎变化。