步骤2：要实现求值的单步执行，W3Eval 在嵌套最深的那对括号中找出优先级最高的操作符。

Step 2: To perform a single step of an evaluation, W3Eval finds the operator with the highest priority inside the deepest nested pair of parentheses.

youdao

步骤2：要实现求值的单步执行，W3Eval 在嵌套最深的那对括号中找出优先级最高的操作符。

Step 2: To perform a single step of an evaluation, W3Eval finds the operator with the highest priority inside the deepest nested pair of parentheses.

youdao