plain die

例句：

1. 1.The plain design of the dress is very popular among young people.
   这款裙子简单大方，很受年轻人欢迎。
2. 2. The plain tablecloth was a welcome change from the ornate one.
   朴素的桌布与华丽的相比，让人眼前一亮。
3. 3. She wore a plain white shirt to the party, which made her look more professional.
   她穿着一件素白衬衫去参加聚会，显得更加专业。