diff --git a/aio/content/translations/cn/api-plan.md b/aio/content/translations/cn/api-plan.md
index 61d8e10a3c..c77c79419d 100644
--- a/aio/content/translations/cn/api-plan.md
+++ b/aio/content/translations/cn/api-plan.md
@@ -77,7 +77,7 @@
 [x]  | common/formatDate  | 0.21
 [x]  | core/ComponentFactoryResolver  | 0.20
 [x]  | forms/Form  | 0.20
-[ ]  | common/http/HttpErrorResponse  | 0.20
+[x]  | common/http/HttpErrorResponse  | 0.20
 [ ]  | core/QueryList  | 0.19
 [ ]  | forms  | 0.19
 [ ]  | animations/state  | 0.19
diff --git a/packages/common/http/src/response.ts b/packages/common/http/src/response.ts
index 9a72499030..e4950d4668 100644
--- a/packages/common/http/src/response.ts
+++ b/packages/common/http/src/response.ts
@@ -11,36 +11,49 @@ import {HttpHeaders} from './headers';
 /**
  * Type enumeration for the different kinds of `HttpEvent`.
  *
+ * 不同种类的 `HttpEvent` 的枚举类型。
  *
  */
 export enum HttpEventType {
   /**
    * The request was sent out over the wire.
+   *
+   * 该请求已经在线路上发出了。
    */
   Sent,
 
   /**
    * An upload progress event was received.
+   *
+   * 收到了上传进度事件。
    */
   UploadProgress,
 
   /**
    * The response status code and headers were received.
+   *
+   * 收到了响应状态码和响应头。
    */
   ResponseHeader,
 
   /**
    * A download progress event was received.
+   *
+   * 收到了下载进度事件。
    */
   DownloadProgress,
 
   /**
    * The full response including the body was received.
+   *
+   * 收到了包括响应体在内的完整响应对象。
    */
   Response,
 
   /**
    * A custom event from an interceptor or a backend.
+   *
+   * 来自拦截器或后端的自定义事件。
    */
   User,
 }
@@ -49,21 +62,28 @@ export enum HttpEventType {
  * Base interface for progress events.
  *
  *
+ * 进度事件的基础接口。
  */
 export interface HttpProgressEvent {
   /**
    * Progress event type is either upload or download.
+   *
+   * 进度事件的类型或者是上传或者是下载。
    */
   type: HttpEventType.DownloadProgress|HttpEventType.UploadProgress;
 
   /**
    * Number of bytes uploaded or downloaded.
+   *
+   * 已经上传或下载的字节数。
    */
   loaded: number;
 
   /**
    * Total number of bytes to upload or download. Depending on the request or
    * response, this may not be computable and thus may not be present.
+   *
+   * 要上传或下载的总字节数。它可能是无法计算出来的，因此也就可能不存在，取决于是请求还是响应。
    */
   total?: number;
 }
@@ -71,6 +91,7 @@ export interface HttpProgressEvent {
 /**
  * A download progress event.
  *
+ * 下载进度事件。
  *
  */
 export interface HttpDownloadProgressEvent extends HttpProgressEvent {
@@ -79,7 +100,11 @@ export interface HttpDownloadProgressEvent extends HttpProgressEvent {
   /**
    * The partial response body as downloaded so far.
    *
+   * 到目前为止已经下载的那部分响应体。
+   *
    * Only present if the responseType was `text`.
+   *
+   * 只有当 responseType 是 `text` 时才会出现。
    */
   partialText?: string;
 }
@@ -87,6 +112,7 @@ export interface HttpDownloadProgressEvent extends HttpProgressEvent {
 /**
  * An upload progress event.
  *
+ * 上传进度事件。
  *
  */
 export interface HttpUploadProgressEvent extends HttpProgressEvent {
@@ -98,6 +124,8 @@ export interface HttpUploadProgressEvent extends HttpProgressEvent {
  * when a request may be retried multiple times, to distinguish between
  * retries on the final event stream.
  *
+ * 用于表示请求已经发到服务器的事件。
+ * 当请求可能被多次接受时很有用，以区分出最终事件流上的重试行为。
  *
  */
 export interface HttpSentEvent { type: HttpEventType.Sent; }
@@ -105,9 +133,12 @@ export interface HttpSentEvent { type: HttpEventType.Sent; }
 /**
  * A user-defined event.
  *
+ * 用户定义的事件。
+ *
  * Grouping all custom events under this type ensures they will be handled
  * and forwarded by all implementations of interceptors.
  *
+ * 把所有自定义事件都分组在此类型下，以确保它们会被所有的拦截器所处理和转发。
  *
  */
 export interface HttpUserEvent<T> { type: HttpEventType.User; }
@@ -116,8 +147,11 @@ export interface HttpUserEvent<T> { type: HttpEventType.User; }
  * An error that represents a failed attempt to JSON.parse text coming back
  * from the server.
  *
+ * 一个错误对象，用来表示当视图用 JSON.parse 对从服务器返回的文本进行解析时出错。
+ *
  * It bundles the Error object with the actual response body that failed to parse.
  *
+ * 它把 `Error` 对象和解析出错的实际响应体绑在一起。
  *
  */
 export interface HttpJsonParseError {
@@ -128,8 +162,11 @@ export interface HttpJsonParseError {
 /**
  * Union type for all possible events on the response stream.
  *
+ * 响应流中所有可能出现的事件的联合类型。
+ *
  * Typed according to the expected type of the response.
  *
+ * 其类型取决于所期待的响应类型。
  *
  */
 export type HttpEvent<T> =
@@ -138,38 +175,53 @@ export type HttpEvent<T> =
 /**
  * Base class for both `HttpResponse` and `HttpHeaderResponse`.
  *
+ * `HttpResponse` 和 `HttpHeaderResponse` 的共同基类。
  *
  */
 export abstract class HttpResponseBase {
   /**
    * All response headers.
+   *
+   * 所有响应头。
    */
   readonly headers: HttpHeaders;
 
   /**
    * Response status code.
+   *
+   * 响应的状态码。
    */
   readonly status: number;
 
   /**
    * Textual description of response status code.
    *
+   * 响应状态码的文本描述。
+   *
    * Do not depend on this.
+   *
+   * 请不要在代码中依赖它。
    */
   readonly statusText: string;
 
   /**
    * URL of the resource retrieved, or null if not available.
+   *
+   * 所接收的资源的 URL，如果不可用则为 `null`。
    */
   readonly url: string|null;
 
   /**
    * Whether the status code falls in the 2xx range.
+   *
+   * 状态码是否位于 2xx 范围内。
    */
   readonly ok: boolean;
 
   /**
    * Type of the response, narrowed to either the full response or the header.
+   *
+   * 响应对象的类型，窄化为完整的响应对象或只有响应头。
    */
   // TODO(issue/24571): remove '!'.
   readonly type !: HttpEventType.Response | HttpEventType.ResponseHeader;
@@ -177,8 +229,12 @@ export abstract class HttpResponseBase {
   /**
    * Super-constructor for all responses.
    *
+   * 所有响应体的上级（super）构造器。
+   *
    * The single parameter accepted is an initialization hash. Any properties
    * of the response passed there will override the default values.
+   *
+   * 接受的唯一参数是一个初始化哈希值。所传进来的响应对象的任何属性都会覆盖这些默认值。
    */
   constructor(
       init: {
@@ -204,14 +260,19 @@ export abstract class HttpResponseBase {
  * A partial HTTP response which only includes the status and header data,
  * but no response body.
  *
+ * 一个部分 HTTP 请求，它只包括状态和响应头数据，但没有响应体。
+ *
  * `HttpHeaderResponse` is a `HttpEvent` available on the response
  * event stream, only when progress events are requested.
  *
+ * `HttpHeaderResponse` 是一个可用于响应事件流的 `HttpEvent`，只有在要求了进度事件时才有效。
  *
  */
 export class HttpHeaderResponse extends HttpResponseBase {
   /**
    * Create a new `HttpHeaderResponse` with the given parameters.
+   *
+   * 根据给定的参数创建新的 `HttpHeaderResponse` 对象。
    */
   constructor(init: {
     headers?: HttpHeaders,
@@ -227,6 +288,8 @@ export class HttpHeaderResponse extends HttpResponseBase {
   /**
    * Copy this `HttpHeaderResponse`, overriding its contents with the
    * given parameter hash.
+   *
+   * 复制这个 `HttpHeaderResponse`，使用给定的参数哈希对象覆盖其内容。
    */
   clone(update: {headers?: HttpHeaders; status?: number; statusText?: string; url?: string;} = {}):
       HttpHeaderResponse {
@@ -245,19 +308,26 @@ export class HttpHeaderResponse extends HttpResponseBase {
  * A full HTTP response, including a typed response body (which may be `null`
  * if one was not returned).
  *
+ * 一个完整的 HTTP 响应对象，包括一个带类型的响应体（如果没返回内容，则为 `null`）。
+ *
  * `HttpResponse` is a `HttpEvent` available on the response event
  * stream.
  *
  *
+ * `HttpResponse` 是一个用于事件响应流的 `HttpEvent`。
  */
 export class HttpResponse<T> extends HttpResponseBase {
   /**
    * The response body, or `null` if one was not returned.
+   *
+   * 响应体，如果没有返回内容则为 `null`。
    */
   readonly body: T|null;
 
   /**
    * Construct a new `HttpResponse`.
+   *
+   * 构造一个新的 `HttpResponse`。
    */
   constructor(init: {
     body?: T | null, headers?: HttpHeaders; status?: number; statusText?: string; url?: string;
@@ -292,6 +362,8 @@ export class HttpResponse<T> extends HttpResponseBase {
  * non-successful HTTP status, an error while executing the request,
  * or some other failure which occurred during the parsing of the response.
  *
+ * 一个用于表示错误或失败的响应对象，或者来自执行请求时发生的错误给出的失败的 HTTP 状态码，或者来自在解析响应对象期间发生的其它错误。
+ *
  * Any error returned on the `Observable` response stream will be
  * wrapped in an `HttpErrorResponse` to provide additional context about
  * the state of the HTTP layer when the error occurred. The error property
@@ -299,6 +371,8 @@ export class HttpResponse<T> extends HttpResponseBase {
  * from the server.
  *
  *
+ * 任何从 `Observable` 响应流中返回的错误都会被包装成 `HttpErrorResponse` 对象，以便在发生错误时，提供关于 HTTP 层状态的额外上下文信息。
+ * 该错误或者包含一个包装好的错误对象，或者包含一个从服务端返回的错误响应体。
  */
 export class HttpErrorResponse extends HttpResponseBase implements Error {
   readonly name = 'HttpErrorResponse';
@@ -307,6 +381,8 @@ export class HttpErrorResponse extends HttpResponseBase implements Error {
 
   /**
    * Errors are never okay, even when the status code is in the 2xx success range.
+   *
+   * 只要是错误，其 `ok` 就永远为 `false`，就算其 HTTP 状态码是 2xx 也一样。
    */
   readonly ok = false;