simple expression

• 简单表达式

simple expression的用法和样例：

例句

1. Complex expressions are one or more simple expressions connected by operators.
   复杂表达式是由运算符连接的一个或多个简单表达式。
2. You have a temp that is assigned to once with a simple expression, and the temp is getting in the way of other refactorings.
   你有一个临时变量，只被一个简单表达式赋值一次，而它妨碍了其他重构手法。