diff --git a/4_Signal-and-Piping/calculator_fifo.c b/4_Signal-and-Piping/calculator_fifo.c
index 42e1c8b..e42b41f 100644
--- a/4_Signal-and-Piping/calculator_fifo.c
+++ b/4_Signal-and-Piping/calculator_fifo.c
@@ -12,25 +12,25 @@ int main() {
 	int num;
 	int sum = 0;
 
-	printf("Calculator started. Waiting for collector...\n");
+	printf("Calculator 已启动，等待 Collector...\n");
 
-	// Open FIFO for reading
+	// 打开 FIFO 以读取
 	fd = open(FIFO_PATH, O_RDONLY);
 	if (fd == -1) {
-		perror("Failed to open FIFO");
+		perror("打开 FIFO 失败");
 		exit(EXIT_FAILURE);
 	}
 
-	printf("Connected! Ready to receive integers.\n");
+	printf("已连接！准备接收整数。\n");
 
-	// Read integers from the FIFO and calculate the sum
+	// 从 FIFO 读取整数并计算总和
 	while (read(fd, &num, sizeof(int)) > 0) {
 		sum += num;
-		printf("Received: %d, Current Sum: %d\n", num, sum);
+		printf("接收到：%d，当前总和：%d\n", num, sum);
 	}
 
 	close(fd);
-	printf("Calculator exiting.\n");
+	printf("Calculator 退出。\n");
 
 	return 0;
 }
\ No newline at end of file
diff --git a/4_Signal-and-Piping/collector_calculator.c b/4_Signal-and-Piping/collector_calculator.c
index 8960441..b8c2ecf 100644
--- a/4_Signal-and-Piping/collector_calculator.c
+++ b/4_Signal-and-Piping/collector_calculator.c
@@ -10,56 +10,56 @@ int main() {
 	pid_t pid;
 	int num, sum = 0;
 
-	// Create pipe
+	// 创建管道
 	if (pipe(pipe_fd) == -1) {
-		perror("Pipe creation failed");
+		perror("管道创建失败");
 		exit(EXIT_FAILURE);
 	}
 
-	// Create child process
+	// 创建子进程
 	pid = fork();
 
 	if (pid < 0) {
-		// Fork failed
-		perror("Fork failed");
+		// fork失败
+		perror("fork 失败");
 		exit(EXIT_FAILURE);
 	}
 	else if (pid == 0) {
-		// Child process - calculator
-		close(pipe_fd[1]); // Close write end of pipe
+		// 子进程 - Calculator
+		close(pipe_fd[1]); // 关闭管道写端
 
-		printf("[Calculator] Started. Waiting for integers...\n");
+		printf("[Calculator] 启动。等待整数...\n");
 
 		while (read(pipe_fd[0], &num, sizeof(int)) > 0) {
 			sum += num;
-			printf("[Calculator] Received: %d, Current Sum: %d\n", num, sum);
+			printf("[Calculator] 收到：%d，当前总和：%d\n", num, sum);
 		}
 
 		close(pipe_fd[0]);
-		printf("[Calculator] Exiting.\n");
+		printf("[Calculator] 退出。\n");
 		exit(EXIT_SUCCESS);
 	}
 	else {
-		// Parent process - collector
-		close(pipe_fd[0]); // Close read end of pipe
+		// 父进程 - Collector
+		close(pipe_fd[0]); // 关闭管道读端
 
-		printf("[Collector] Started. Enter integers (Ctrl+D to exit):\n");
+		printf("[Collector] 启动。输入整数（Ctrl+D 退出）：\n");
 
 		while (scanf("%d", &num) == 1) {
 			if (write(pipe_fd[1], &num, sizeof(int)) == -1) {
-				perror("Write error");
+				perror("写入错误");
 				break;
 			}
-			printf("[Collector] Sent: %d\n", num);
+			printf("[Collector] 已发送：%d\n", num);
 		}
 
-		close(pipe_fd[1]); // Close write end to signal EOF to child
-		printf("[Collector] Waiting for calculator to finish...\n");
+		close(pipe_fd[1]); // 关闭管道写端以向子进程发送EOF信号
+		printf("[Collector] 等待 Calculator 完成...\n");
 
-		// Wait for child to finish
+		// 等待子进程完成
 		wait(NULL);
 
-		printf("[Collector] Exiting.\n");
+		printf("[Collector] 退出。\n");
 	}
 
 	return 0;
diff --git a/4_Signal-and-Piping/collector_fifo.c b/4_Signal-and-Piping/collector_fifo.c
index d0f1d68..6c89e41 100644
--- a/4_Signal-and-Piping/collector_fifo.c
+++ b/4_Signal-and-Piping/collector_fifo.c
@@ -13,33 +13,33 @@ int main() {
 	int fd;
 	int num;
 
-	// Create the FIFO if it doesn't exist
+	// 创建 FIFO 如果不存在
 	if (mkfifo(FIFO_PATH, 0666) == -1 && errno != EEXIST) {
-		perror("mkfifo error");
+		perror("创建 FIFO 失败");
 		exit(EXIT_FAILURE);
 	}
 
-	printf("Collector started. Connecting to calculator...\n");
+	printf("Collector 已启动，正在连接 Calculator...\n");
 
-	// Open FIFO for writing
+	// 打开 FIFO 以写入
 	fd = open(FIFO_PATH, O_WRONLY);
 	if (fd == -1) {
-		perror("Failed to open FIFO");
+		perror("打开 FIFO 失败");
 		exit(EXIT_FAILURE);
 	}
 
-	printf("Connected! Enter integers (Ctrl+D to exit):\n");
+	printf("已连接！输入整数（Ctrl+D 退出）：\n");
 
 	while (scanf("%d", &num) == 1) {
 		if (write(fd, &num, sizeof(int)) == -1) {
-			perror("Write error");
+			perror("写入错误");
 			break;
 		}
-		printf("Sent: %d\n", num);
+		printf("已发送：%d\n", num);
 	}
 
 	close(fd);
-	printf("Collector exiting.\n");
+	printf("Collector 退出。\n");
 
 	return 0;
 }
\ No newline at end of file
diff --git a/4_Signal-and-Piping/even_numbers.c b/4_Signal-and-Piping/even_numbers.c
index af534e5..56b4a59 100644
--- a/4_Signal-and-Piping/even_numbers.c
+++ b/4_Signal-and-Piping/even_numbers.c
@@ -3,30 +3,30 @@
 #include <signal.h>
 #include <unistd.h>
 
-volatile int number = 0;	// Current even number
-volatile int direction = 1; // 1 for ascending, -1 for descending
+volatile int number = 0;	// 当前偶数
+volatile int direction = 1; // 1 表示递增，-1 表示递减
 
 void handle_sigint(int sig) {
-	// Change direction when CTRL+C is pressed
+	// 按下 Ctrl+C 时改变方向
 	direction = -direction;
-	printf("\nChanging direction to %s\n",
-		(direction > 0) ? "ascending" : "descending");
-	// Re-register the signal handler
+	printf("\n方向已切换为 %s\n",
+		(direction > 0) ? "递增" : "递减");
+	// 重新注册信号处理函数
 	signal(SIGINT, handle_sigint);
 }
 
 int main() {
-	// Register SIGINT handler
+	// 注册 SIGINT 信号处理函数
 	signal(SIGINT, handle_sigint);
 
-	printf("Starting program: outputting even numbers\n");
-	printf("Press Ctrl+C to change direction\n");
+	printf("程序启动：输出偶数\n");
+	printf("按下 Ctrl+C 可切换方向\n");
 
 	while (1) {
 		printf("%d\n", number);
-		number += 2 * direction; // Add or subtract 2 based on direction
-		fflush(stdout);			 // Force output to be displayed immediately
-		sleep(1);				 // Wait for 1 second
+		number += 2 * direction; // 根据方向加或减 2
+		fflush(stdout);			 // 强制立即显示输出
+		sleep(1);				 // 等待 1 秒
 	}
 
 	return 0;