diff --git a/ch4-rpc/ch4-07-pbgo.md b/ch4-rpc/ch4-07-pbgo.md
index 724a629..9f036e5 100644
--- a/ch4-rpc/ch4-07-pbgo.md
+++ b/ch4-rpc/ch4-07-pbgo.md
@@ -61,8 +61,6 @@ service HelloService {
 在本章的第二节我们已经简单讲述过Protobuf插件的工作原理，并且展示了如何生成RPC必要的代码。插件是一个generator.Plugin接口：
 
 ```go
-// A Plugin provides functionality to add to the output during Go code generation,
-// such as to produce RPC stubs.
 type Plugin interface {
 	// Name identifies the plugin.
 	Name() string
@@ -70,7 +68,8 @@ type Plugin interface {
 	// code generation begins.
 	Init(g *Generator)
 	// Generate produces the code generated by the plugin for this file,
-	// except for the imports, by calling the generator's methods P, In, and Out.
+	// except for the imports, by calling the generator's methods P, In,
+	// and Out.
 	Generate(file *FileDescriptor)
 	// GenerateImports produces the import declarations for this file.
 	// It is called after Generate.
@@ -106,9 +105,12 @@ pbgo为服务的方法定义了一个rest_api名字的扩展，在最终生成
 下面是getServiceMethodOption方法的实现：
 
 ```go
-func (p *pbgoPlugin) getServiceMethodOption(m *descriptor.MethodDescriptorProto) *pbgo.HttpRule {
+func (p *pbgoPlugin) getServiceMethodOption(
+	m *descriptor.MethodDescriptorProto,
+) *pbgo.HttpRule {
 	if m.Options != nil && proto.HasExtension(m.Options, pbgo.E_RestApi) {
-		if ext, _ := proto.GetExtension(m.Options, pbgo.E_RestApi); ext != nil {
+		ext, _ := proto.GetExtension(m.Options, pbgo.E_RestApi)
+		if ext != nil {
 			if x, _ := ext.(*pbgo.HttpRule); x != nil {
 				return x
 			}
@@ -159,7 +161,9 @@ func HelloServiceHandler(svc HelloServiceInterface) http.Handler {
 代码中选择的是开源中比较流行的httprouter路由引擎。其中_handle_HelloService_Hello_get函数用于将Hello方法注册到路由处理器：
 
 ```go
-func _handle_HelloService_Hello_get(router *httprouter.Router, svc HelloServiceInterface) {
+func _handle_HelloService_Hello_get(
+	router *httprouter.Router, svc HelloServiceInterface,
+) {
 	router.Handle("GET", "/hello/:value",
 		func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
 			var protoReq, protoReply String
@@ -190,7 +194,7 @@ func _handle_HelloService_Hello_get(router *httprouter.Router, svc HelloServiceI
 
 ## 启动REST服务
 
-虽然从头构造pbgo框架的过程比较繁琐，但是使用pbgo构造REST服务缺是异常简单。首先要构造一个满足HelloServiceInterface接口的服务对象：
+虽然从头构造pbgo框架的过程比较繁琐，但是使用pbgo构造REST服务却是异常简单。首先要构造一个满足HelloServiceInterface接口的服务对象：
 
 ```go
 import (