diff --git a/main.py b/main.py
index b260039..9c064f8 100644
--- a/main.py
+++ b/main.py
@@ -73,6 +73,19 @@ def fib(n):
     return seq
 
 
+
+def reverse(s):
+    """返回字符串反转结果。"""
+    return s[::-1]
+
+
+
+
+
+
+
+
+
 def main():
     """命令行入口，通过子命令调用各功能。"""
     parser = argparse.ArgumentParser(description="GitHub 学习工具箱")
@@ -93,6 +106,10 @@ def main():
     p_fib = sub.add_parser("fib", help="斐波那契数列")
     p_fib.add_argument("n", type=int, help="项数")
 
+    p_rev = sub.add_parser("reverse", help="字符串反转")
+    p_rev.add_argument("text", help="要反转的文本")
+
+
     args = parser.parse_args()
 
     if args.cmd == "calc":
@@ -109,6 +126,11 @@ def main():
     elif args.cmd == "fib":
         print(fib(args.n))
 
+    elif args.cmd == "reverse":
+        print(reverse(args.text))
+
+        
+
 
 if __name__ == "__main__":
     main()