步骤3：如果表达式中不包含其它括号，求值的过程就完成。
Step 3: If the expression doesn't contain any more parentheses, the process of evaluation is finished.
圆括号内是空的，表示了这种方法不包含任何参数。
The parentheses are empty, which indicates that the method takes no arguments.
圆括号内是空的，表示了这种方法不包含任何参数。
The parentheses are empty, which indicates that the method takes no arguments.
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