diff --git a/src/study/day10Goroutines/LinkChannels.go b/src/study/day10Goroutines/LinkChannels.go
index 0fe6441..8be5acb 100644
--- a/src/study/day10Goroutines/LinkChannels.go
+++ b/src/study/day10Goroutines/LinkChannels.go
@@ -13,24 +13,37 @@ func main() {
 		close(natural) // 关闭channel
 	}()
 
+	//// squarer
+	//go func() {
+	//	for {
+	//		x, ok := <-natural
+	//		if !ok {
+	//			break // channel关闭，跳出循环
+	//		}
+	//		square <- x * x
+	//	}
+	//	close(square)
+	//}()
+	//
+	//// printer (in main goroutine)
+	//for {
+	//	x, ok := <-square
+	//	if !ok {
+	//		break
+	//	}
+	//	println(x)
+	//}
+
 	// squarer
 	go func() {
-		for {
-			x, ok := <-natural
-			if !ok {
-				break // channel关闭，跳出循环
-			}
+		for x := range natural {
 			square <- x * x
 		}
 		close(square)
 	}()
 
 	// printer (in main goroutine)
-	for {
-		x, ok := <-square
-		if !ok {
-			break
-		}
+	for x := range square {
 		println(x)
 	}
 }