diff --git a/source/chapter2/05_Control_Flow.md b/source/chapter2/05_Control_Flow.md
index 94f2aabf..c5289714 100644
--- a/source/chapter2/05_Control_Flow.md
+++ b/source/chapter2/05_Control_Flow.md
@@ -500,7 +500,7 @@ default:
 // 输出 "(1, 1) is inside the box"
 ```
 
-<img src="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Art/coordinateGraphSimple_2x.png" width="288" height="288">
+![image](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Art/coordinateGraphSimple_2x.png)
 
 在上面的例子中，`switch`语句会判断某个点是否是原点(0, 0)，是否在红色的x轴上，是否在黄色y轴上，是否在一个以原点为中心的4x4的矩形里，或者在这个矩形外面。
 
@@ -527,7 +527,7 @@ case let (x, y):
 // 输出 "on the x-axis with an x value of 2"
 ```
 
-<img src="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Art/coordinateGraphMedium_2x.png" width="288" height="288">
+![image](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Art/coordinateGraphMedium_2x.png)
 
 在上面的例子中，`switch`语句会判断某个点是否在红色的x轴上，是否在黄色y轴上，或者不在坐标轴上。
 
@@ -559,7 +559,7 @@ case let (x, y):
 // 输出 "(1, -1) is on the line x == -y"
 ```
 
-<img src="https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Art/coordinateGraphComplex_2x.png" width="289" height="290">
+![image](https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Art/coordinateGraphComplex_2x.png)
 
 在上面的例子中，`switch`语句会判断某个点是否在绿色的对角线`x == y`上，是否在紫色的对角线`x == -y`上，或者不在对角线上。