diff --git a/history/003_trap/src/main/java/com/github/drinkjava2/frog/brain/organ/Pain.java b/history/003_trap/src/main/java/com/github/drinkjava2/frog/brain/organ/Pain.java
new file mode 100644
index 0000000..bac4b18
--- /dev/null
+++ b/history/003_trap/src/main/java/com/github/drinkjava2/frog/brain/organ/Pain.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2018 the original author or authors. 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
+ * applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
+ * OF ANY KIND, either express or implied. See the License for the specific
+ * language governing permissions and limitations under the License.
+ */
+package com.github.drinkjava2.frog.brain.organ;
+
+import java.awt.Color;
+
+import com.github.drinkjava2.frog.Application;
+import com.github.drinkjava2.frog.Env;
+import com.github.drinkjava2.frog.Frog;
+import com.github.drinkjava2.frog.brain.BrainPicture;
+import com.github.drinkjava2.frog.brain.Cell;
+import com.github.drinkjava2.frog.brain.Input;
+import com.github.drinkjava2.frog.brain.Organ;
+
+/**
+ * Pain zone active after some bad thing happen like close to edge, hurt...
+ * 
+ * 痛是一种惩罚，表示青蛙做错了什么，但是又不至严重到判其死亡的地步
+ */
+public class Pain extends Organ { // Pain器官目前激活的条件是离边境20个单元之类，痛苦和快感是条件反射形成的前题
+
+	private static final long serialVersionUID = 1L;
+
+	@Override
+	public void initFrog(Frog f) {
+		if (!initilized) {
+			initilized = true;
+			organOutputEnergy = 5;
+		}
+	}
+
+	@Override
+	public void drawOnBrainPicture(Frog f, BrainPicture pic) {// 把自已这个器官在脑图上显示出来
+		if (!Application.SHOW_FIRST_FROG_BRAIN)
+			return;
+		if (Env.closeToEdge(f)) {
+			pic.fillZone(this);
+		} else {
+			pic.setColor(Color.white);
+			pic.fillZone(this);
+			pic.setColor(Color.BLACK);
+			pic.drawZone(this);
+		}
+		if (this.name != null)
+			pic.drawText(this, String.valueOf(this.name));
+	}
+
+	@Override
+	public void active(Frog f) {
+		if (Env.closeToEdge(f)) {// 如果靠近边界，痛苦信号生成
+			for (Cell cell : f.cells) {
+				if (cell.energy > 0)
+					cell.energy--;
+				if (cell.energy < Cell.MAX_ENERGY_LIMIT)
+					for (Input input : cell.inputs)
+						if (input.nearby(this)) // if input zone nearby this zone
+							cell.energy += organOutputEnergy;
+			}
+		}
+	}
+
+}