diff --git a/lib/grpc.js b/lib/grpc.js
index 5d6a81a..c7b15ec 100755
--- a/lib/grpc.js
+++ b/lib/grpc.js
@@ -139,20 +139,20 @@ module.exports = class GrpcLoader {
   }
 
   service (name) {
-    assert(this._types, 'Must called init() first. 尚未加载proto文件到loader.')
+    assert(this._types, 'Must called init() first. proto file has not been loaded.')
     const fullName = this._isDev ? `${this._packagePrefix}.${name}` : name
     debug('get service:', fullName)
     const service = _.get(this._types, `${fullName}.service`)
-    assert(service, `Cannot find service with name: ${fullName}, 请检查protos文件是否配置错误，或者漏掉了对应的proto文件`)
+    assert(service, `Cannot find service with name: ${fullName}, please check if the protos file is configured incorrectly or if the corresponding proto file is missing.`)
     return service
   }
 
   type (name) {
-    assert(this._types, 'Must called init() first. 尚未加载proto文件到loader.')
+    assert(this._types, 'Must called init() first. proto file has not been loaded.')
     const fullName = this._isDev ? `${this._packagePrefix}.${name}` : name
     debug('get type:', fullName)
     const type = _.get(this._types, `${fullName}`)
-    assert(type, `Cannot find type with name: ${fullName}, 请检查protos文件是否配置错误，或者漏掉了对应的proto文件`)
+    assert(type, `Cannot find type with name: ${fullName}, please check if the protos file is configured incorrectly or if the corresponding proto file is missing.`)
     return type
   }
 
@@ -240,7 +240,7 @@ module.exports = class GrpcLoader {
   }
 
   makeMetadata (initialValues) {
-    assert(this._types, 'Must called init() first. 尚未加载proto文件到loader.')
+    assert(this._types, 'Must called init() first. proto file has not been loaded.')
     const meta = new grpc.Metadata()
     if (typeof initialValues === 'object') {
       Object.entries(initialValues).forEach(([key, value]) => {
@@ -261,7 +261,7 @@ module.exports = class GrpcLoader {
   }
 
   initServer (...args) {
-    assert(this._types, 'Must called init() first. 尚未加载proto文件到loader.')
+    assert(this._types, 'Must called init() first. proto file has not been loaded.')
     return serverProxy._init(this, ...args)
   }
 }
diff --git a/lib/proxy/serverProxy.js b/lib/proxy/serverProxy.js
index 1a17837..88944ca 100644
--- a/lib/proxy/serverProxy.js
+++ b/lib/proxy/serverProxy.js
@@ -179,6 +179,7 @@ class ServerProxy {
     if (!requestStream && responseStream) {
       return this._callServerStreamProxyMethod(target, key, fn)
     }
+    // duplex stream
     if (requestStream && responseStream) {
       return this._callDuplexStreamProxyMethod(target, key, fn)
     }
diff --git a/lib/util/compose.js b/lib/util/compose.js
index 97044fa..b169b99 100644
--- a/lib/util/compose.js
+++ b/lib/util/compose.js
@@ -14,10 +14,10 @@ module.exports = (middleware) => {
   }
 
   /**
-     * @param {Object} context
-     * @return {Promise}
-     * @api public
-     */
+   * @param {Object} context
+   * @return {Promise}
+   * @api public
+   */
   return function (context, next) {
     // last called middleware #
     let index = -1