diff --git a/1st.cpp b/1st.cpp
index 73d70ee..7ee1770 100644
--- a/1st.cpp
+++ b/1st.cpp
@@ -2,6 +2,8 @@ class Device {
 public:
     virtual void turnOn() = 0;
     virtual void turnOff() = 0;
+    virtual bool needsWarmup() {return false;};// 判斷馬達是否需要預熱
+    virtual void warmup() = 0;
     virtual ~Device() {}
 };
 
@@ -23,4 +25,11 @@ public:
     void turnOff() override {
         // 關閉馬達
     }
+private:
+    bool needsWarmup() override {
+        return true; // 馬達需要預熱
+    }
+    void warmup() override {
+        // 預熱馬達
+    }
 };
\ No newline at end of file