plain cylindrical plug gauge

例句：

1. 1. The plain design of the dress is very popular among young women.
   这件衣服简单的设计很受年轻女性欢迎。
2. 2. He wore a plain shirt and tie for the occasion.
   他穿着一件简单的衬衫和领带出席这个场合。
3. 3. The plain house was surrounded by greenery.
   那所简朴的房子周围是郁郁葱葱的绿意。