单纯

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 teacher explained the problem in a simple way.
   老师用简单的方式解释了这个问题。
3. 3. Simple pleasures are often the best.
   最简单的快乐往往是最好的。