diff --git a/src/SeniorProblem.java b/src/SeniorProblem.java
index fe22fe5..8b6f9e2 100644
--- a/src/SeniorProblem.java
+++ b/src/SeniorProblem.java
@@ -15,27 +15,27 @@ public class SeniorProblem implements ProblemsGenerator {
   public String generate() {
     String expression;
     boolean hasTrig;
+    
     do {
+      // 生成基础表达式并添加括号
       int numCount = RANDOM.nextInt(5) + 1;
       expression = expressionBuilder.generateBasicExpression(numCount);
-      List<Integer> numPositions = expressionBuilder.getNumberPositions(expression);
+      expression = bracketManager.addNestedParentheses(expression);
       
-      if (RANDOM.nextDouble() < 0.8) {
-        int pairs = bracketManager.decideParenthesesPairs(numCount);
-        if (pairs > 0) {
-          expression = bracketManager.addParentheses(expression, pairs, numPositions);
-        }
-      }
+      // 获取初始数字位置
+      List<Integer> numPositions = expressionBuilder.getNumberPositions(expression);
       
-      // 添加三角函数并检查是否存在
+      // 添加三角函数并重新获取数字位置
       expression = trigManager.addTrigOperations(expression, numPositions);
-      List<Integer> trigPositions = expressionBuilder.getNumberPositions(expression);
-      hasTrig = expression.contains("sin") || expression.contains("cos") || expression.contains("tan");
+      List<Integer> numPositionsAfterTrig = expressionBuilder.getNumberPositions(expression);
       
-      // 40% 概率加幂运算，避免与 trig 重叠
-      if (RANDOM.nextDouble() < 0.4) {
-        expression = powerManager.addPowerOperationsAvoid(expression, numPositions, trigPositions);
+      // 判断是否包含三角函数
+      hasTrig = expression.contains("sin") || expression.contains("cos") || expression.contains("tan");
+      // 添加幂运算，50%概率执行
+      if (RANDOM.nextDouble() < 0.5) {
+        expression = powerManager.addPowerOperations(expression, numPositionsAfterTrig, null);
       }
+      
     } while (expressionBuilder.hasDivideByZero(expression) || !hasTrig);
     
     return expression;