If the expression doesn't contain any more parentheses, the process of evaluation is finished.
如果表达式再不包含任何其它的括号，求值(过程)完成。
Step 3: If the expression doesn't contain any more parentheses, the process of evaluation is finished.
步骤 3：如果表达式中不包含其它括号，求值的过程就完成。
When a program is run, the process of carrying out each of the specified operations in an expression is called evaluation.
当一个程序运行时，完成表达式中指定操作的过程被称为赋值。
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