diff --git a/kernel_liteos_a-master/testsuites/unittest/net/netdb/full/net_netdb_test_002.cpp b/kernel_liteos_a-master/testsuites/unittest/net/netdb/full/net_netdb_test_002.cpp
index 2e29594..cbbc04b 100644
--- a/kernel_liteos_a-master/testsuites/unittest/net/netdb/full/net_netdb_test_002.cpp
+++ b/kernel_liteos_a-master/testsuites/unittest/net/netdb/full/net_netdb_test_002.cpp
@@ -32,40 +32,60 @@
 
 #include "lt_net_netdb.h"
 
+// 测试函数AddrInfoTest的定义
 static int AddrInfoTest(void)
 {
-    // Prerequisite: correct DNS servers must be configured.
+    // 假设DNS服务器配置正确
     char host_file[] = "127.0.0.2 example.com\n", serv_file[] = "ftp		21/tcp\n";
+    // 文件路径数组
     char *pathList[] = {"/etc/hosts", "/etc/services"};
+    // 要写入文件的内容数组
     char *streamList[] = {host_file, serv_file};
+    // 内容长度数组
     int streamLen[] = {sizeof(host_file), sizeof(serv_file)};
+    // 文件数量
     const int file_number = 2;
+    // 准备文件环境
     int flag = PrepareFileEnv(pathList, streamList, streamLen, file_number);
     if (flag != 0) {
+        // 如果准备失败，恢复文件环境并返回错误
         RecoveryFileEnv(pathList, file_number);
         return -1;
     }
 
+    // 声明addrinfo结构体指针
     struct addrinfo *addr = NULL;
+    // 使用getaddrinfo函数解析域名和端口
     int ret = getaddrinfo("example.com", "ftp", NULL, &addr);
+    // 断言getaddrinfo函数返回0，表示成功
     ICUNIT_ASSERT_EQUAL(ret, 0, ret);
 
+    // 释放addrinfo结构体
     freeaddrinfo(addr);
 
+    // 尝试解析一个不存在的域名和端口
     ret = getaddrinfo("local", "ftp", NULL, &addr);
+    // 断言getaddrinfo函数返回EAI_AGAIN，表示临时失败
     ICUNIT_ASSERT_EQUAL(ret, EAI_AGAIN, ret);
 
+    // 尝试解析一个不存在的服务名称
     ret = getaddrinfo("localhost", "fp", NULL, &addr);
+    // 断言getaddrinfo函数返回EAI_SERVICE，表示服务名称错误
     ICUNIT_ASSERT_EQUAL(ret, EAI_SERVICE, ret);
 
+    // 获取错误信息字符串
     const char *p = gai_strerror(EAI_AGAIN);
+    // 断言错误信息字符串不为空
     ICUNIT_ASSERT_NOT_EQUAL(p, NULL, -1);
 
+    // 恢复文件环境
     RecoveryFileEnv(pathList, file_number);
     return ICUNIT_SUCCESS;
 }
 
+// 测试用例NetNetDbTest002的定义
 void NetNetDbTest002(void)
 {
+    // 添加测试用例
     TEST_ADD_CASE(__FUNCTION__, AddrInfoTest, TEST_POSIX, TEST_TCP, TEST_LEVEL0, TEST_FUNCTION);
 }