diff --git a/Losetta.Runtime/Core/Extension/Alice.Core.Dictionary.cs b/Losetta.Runtime/Core/Extension/Alice.Core.Dictionary.cs
index 14d2606..da3723c 100644
--- a/Losetta.Runtime/Core/Extension/Alice.Core.Dictionary.cs
+++ b/Losetta.Runtime/Core/Extension/Alice.Core.Dictionary.cs
@@ -65,6 +65,24 @@ public static bool Remove(this Dictionary<Variable, Variable> dict, Variable key
         {
             return dict.Remove(key);
         }
+        public static bool Remove(this Dictionary<Variable, Variable> dict, Variable key, [Ref] Variable value)
+        {
+#if NETCOREAPP2_0_OR_GREATER
+            bool cond = dict.Remove(key, out var result);
+#else
+            dict.TryGetValue(key, out var result);
+            bool cond = dict.Remove();
+#endif
+            if (cond)
+            {
+                value.Assign(result);
+            }
+            else
+            {
+                value.AssignNull();
+            }
+            return dict.Remove(key);
+        }
         public static void TrimExcess(this Dictionary<Variable, Variable> dict)
         {
             dict.TrimExcess();