simplicity of operator

例句：

1. 1. The designof the new product is very simple.
   新产品的设计非常简洁。
2. 2. The simplicity of life oftenmakes us feel relaxed.
   生活的简单常常让我们感到放松。
3. 3. The simplicity of the problem madeit easy to solve.
   问题的简单性使得解决它变得容易。