plain bumper

例句：

1. 1. The plain wooden table is sturdy and easy to clean.
   这个简单的木桌子既坚固又容易清洁。
2. 2. Her plain clothes made her look more like a worker than a fashion model.
   她朴素的衣服让她看起来像一个工人而不是时尚模特。
3. 3. He prefers plain food to fancy dishes because he's trying to lose weight.
   他更喜欢简单的食物而不是花哨的菜肴，因为他正在尝试减肥。