simple protein

例句：

1. 1. The simple design of the house is very appealing.
   房子的简单设计非常吸引人。
2. 2. The task was too simple for her to be challenging.
   这个任务对她来说太简单了，无法具有挑战性。
3. 3. The teacher explained the concept in a simple way that everyone could understand.
   老师用简单的方式解释了这个概念，每个人都能理解。