diff --git a/aio/content/translations/cn/api-plan.md b/aio/content/translations/cn/api-plan.md
index 3d58127c08..745c9e63fd 100644
--- a/aio/content/translations/cn/api-plan.md
+++ b/aio/content/translations/cn/api-plan.md
@@ -89,7 +89,7 @@
 [x]  | core/AfterViewInit  | 0.18
 [x]  | forms/ReactiveFormsModule  | 0.18
 [x]  | common/http/HTTP_INTERCEPTORS  | 0.18
-[ ]  | platform-browser/DomSanitizer  | 0.18
+[x]  | platform-browser/DomSanitizer  | 0.18
 [ ]  | core/PipeTransform  | 0.18
 [ ]  | core/SimpleChange  | 0.18
 [ ]  | core/SimpleChanges  | 0.18
diff --git a/packages/platform-browser/src/security/dom_sanitization_service.ts b/packages/platform-browser/src/security/dom_sanitization_service.ts
index 7c2dd51bb5..452a876fe4 100644
--- a/packages/platform-browser/src/security/dom_sanitization_service.ts
+++ b/packages/platform-browser/src/security/dom_sanitization_service.ts
@@ -18,6 +18,7 @@ export {SecurityContext};
  * Marker interface for a value that's safe to use in a particular context.
  *
  *
+ * 一个标记性接口，用于表示一个值可以安全的用在特定的上下文中。
  */
 export interface SafeValue {}
 
@@ -25,6 +26,7 @@ export interface SafeValue {}
  * Marker interface for a value that's safe to use as HTML.
  *
  *
+ * 一个标记性接口，用于表示一个值可以安全地用在 HTML 上下文中。
  */
 export interface SafeHtml extends SafeValue {}
 
@@ -32,6 +34,7 @@ export interface SafeHtml extends SafeValue {}
  * Marker interface for a value that's safe to use as style (CSS).
  *
  *
+ * 一个标记性接口，用于表示一个值可以安全地用在样式（CSS）上下文中。
  */
 export interface SafeStyle extends SafeValue {}
 
@@ -39,6 +42,7 @@ export interface SafeStyle extends SafeValue {}
  * Marker interface for a value that's safe to use as JavaScript.
  *
  *
+ * 一个标记性接口，用于表示一个值可以安全地用在 JavaScript 上下文中。
  */
 export interface SafeScript extends SafeValue {}
 
@@ -46,6 +50,7 @@ export interface SafeScript extends SafeValue {}
  * Marker interface for a value that's safe to use as a URL linking to a document.
  *
  *
+ * 一个标记性接口，用于表示一个值可以安全地用作 URL 链接到一个文档。
  */
 export interface SafeUrl extends SafeValue {}
 
@@ -53,6 +58,7 @@ export interface SafeUrl extends SafeValue {}
  * Marker interface for a value that's safe to use as a URL to load executable code from.
  *
  *
+ * 一个标记性接口，用于表示一个值可以安全地用作 URL 以加载可执行代码。
  */
 export interface SafeResourceUrl extends SafeValue {}
 
@@ -60,41 +66,65 @@ export interface SafeResourceUrl extends SafeValue {}
  * DomSanitizer helps preventing Cross Site Scripting Security bugs (XSS) by sanitizing
  * values to be safe to use in the different DOM contexts.
  *
+ * DomSanitizer 可以把值净化为在不同 DOM 上下文中的安全内容，来帮你防范跨站脚本攻击（XSS）类的安全问题。
+ *
  * For example, when binding a URL in an `<a [href]="someValue">` hyperlink, `someValue` will be
  * sanitized so that an attacker cannot inject e.g. a `javascript:` URL that would execute code on
  * the website.
  *
+ * 比如，如果要在 `<a [href]="someValue">` 的链接中绑定一个 URL，`someValue` 将会被净化，
+ * 以防范攻击者注入 `javascript:` 之类的 URL，并借此在网站上执行代码。
+ *
  * In specific situations, it might be necessary to disable sanitization, for example if the
  * application genuinely needs to produce a `javascript:` style link with a dynamic value in it.
  * Users can bypass security by constructing a value with one of the `bypassSecurityTrust...`
  * methods, and then binding to that value from the template.
  *
+ * 在特定场景下，可能要禁用净化机制，比如，如果应用程序真的需要生成具有动态值的 `javascript:` 链接。
+ * 用户可以通过使用 `bypassSecurityTrust...` 方法来构建出一个值，以绕过安全性检查，并在模板中绑定它。
+ *
  * These situations should be very rare, and extraordinary care must be taken to avoid creating a
  * Cross Site Scripting (XSS) security bug!
  *
+ * 这种场景其实非常罕见，必须特别小心，避免引入跨站脚本攻击（XSS）类的安全风险。
+ *
  * When using `bypassSecurityTrust...`, make sure to call the method as early as possible and as
  * close as possible to the source of the value, to make it easy to verify no security bug is
  * created by its use.
  *
+ * 当使用 `bypassSecurityTrust...` 时，请尽量确保尽早调用该方法，并且让他尽可能接近值的来源，以便能更容易地验证使用它时有没有引入安全风险。
+ *
  * It is not required (and not recommended) to bypass security if the value is safe, e.g. a URL that
  * does not start with a suspicious protocol, or an HTML snippet that does not contain dangerous
  * code. The sanitizer leaves safe values intact.
  *
+ * 如果该值本身是安全的，则不需要绕过安全性检查，比如那些没有使用可疑协议的 URL 或者不包含危险代码的 HTML 片段。
+ * 净化器会确保值的安全性。
+ *
  * @security Calling any of the `bypassSecurityTrust...` APIs disables Angular's built-in
  * sanitization for the value passed in. Carefully check and audit all values and code paths going
  * into this call. Make sure any user data is appropriately escaped for this security context.
  * For more detail, see the [Security Guide](http://g.co/ng/security).
  *
  *
+ * 调用任何 `bypassSecurityTrust...` API 都会禁用 Anuglar 对传入的值的内置净化机制。
+ * 要小心翼翼的检查和审计所有的值和到该调用的代码执行路径。
+ * 要确保任何一个用户数据都针对这个安全上下文进行过适当的转义（escape）。
+ * 欲知详情，参见[安全](http://g.co/ng/security)。
  */
 export abstract class DomSanitizer implements Sanitizer {
   /**
    * Sanitizes a value for use in the given SecurityContext.
    *
+   * 为在给定的 SecurityContext 中使用而对 `value` 进行转义。
+   *
    * If value is trusted for the context, this method will unwrap the contained safe value and use
    * it directly. Otherwise, value will be sanitized to be safe in the given context, for example
    * by replacing URLs that have an unsafe protocol part (such as `javascript:`). The implementation
    * is responsible to make sure that the value can definitely be safely used in the given context.
+   *
+   * 如果这个值在这个上下文中是可信的，则该方法会解开所包含的安全值，并且直接使用它；否则，这个值就会根据给定的安全上下文净化成安全的，比如替换那些具有不安全协议（例如 `javascript:`）的 URL。
+   * 该实现负责确保在给定的上下文中可以绝对安全的使用该值。
    */
   abstract sanitize(context: SecurityContext, value: SafeValue|string|null): string|null;
 
@@ -103,24 +133,37 @@ export abstract class DomSanitizer implements Sanitizer {
    * is unsafe (e.g. contains `<script>` tags) and the code should be executed. The sanitizer will
    * leave safe HTML intact, so in most situations this method should not be used.
    *
+   * 绕过安全检查，并信任给定的值是一个安全的 HTML。只有当要绑定的 HTML 是不安全内容（比如包含 `<script>`）而且你确实希望运行这些代码时，才需要使用它。
+   * 净化器会确保安全 HTML 的完整性，因此在大多数场景下都不需要使用该方法。
+   *
    * **WARNING:** calling this method with untrusted user data exposes your application to XSS
    * security risks!
+   *
+   * **警告：** 使用不可信的用户数据调用此方法将会让你的应用暴露在 XSS 安全风险之下！
    */
   abstract bypassSecurityTrustHtml(value: string): SafeHtml;
 
   /**
    * Bypass security and trust the given value to be safe style value (CSS).
    *
+   * 绕过安全检查，并信任给定的值是一个安全的样式（CSS）。
+   *
    * **WARNING:** calling this method with untrusted user data exposes your application to XSS
    * security risks!
+   *
+   * **警告：** 使用不可信的用户数据调用此方法将会让你的应用暴露在 XSS 安全风险之下！
    */
   abstract bypassSecurityTrustStyle(value: string): SafeStyle;
 
   /**
    * Bypass security and trust the given value to be safe JavaScript.
    *
+   * 绕过安全检查，并信任给定的值是一个安全的JavaScript。
+   *
    * **WARNING:** calling this method with untrusted user data exposes your application to XSS
    * security risks!
+   *
+   * **警告：** 使用不可信的用户数据调用此方法将会让你的应用暴露在 XSS 安全风险之下！
    */
   abstract bypassSecurityTrustScript(value: string): SafeScript;
 
@@ -128,8 +171,12 @@ export abstract class DomSanitizer implements Sanitizer {
    * Bypass security and trust the given value to be a safe style URL, i.e. a value that can be used
    * in hyperlinks or `<img src>`.
    *
+   * 绕过安全检查，并信任给定的值是一个安全的样式 URL。也就是说该值可安全地用在链接或 `<img src>` 中。
+   *
    * **WARNING:** calling this method with untrusted user data exposes your application to XSS
    * security risks!
+   *
+   * **警告：** 使用不可信的用户数据调用此方法将会让你的应用暴露在 XSS 安全风险之下！
    */
   abstract bypassSecurityTrustUrl(value: string): SafeUrl;
 
@@ -137,8 +184,12 @@ export abstract class DomSanitizer implements Sanitizer {
    * Bypass security and trust the given value to be a safe resource URL, i.e. a location that may
    * be used to load executable code from, like `<script src>`, or `<iframe src>`.
    *
+   * 绕过安全检查，并信任给定的值是一个安全的资源 URL。也就是说该地址可以安全的用于加载可执行代码，比如 `<script src>` 或 `<iframe src>`。
+   *
    * **WARNING:** calling this method with untrusted user data exposes your application to XSS
    * security risks!
+   *
+   * **警告：** 使用不可信的用户数据调用此方法将会让你的应用暴露在 XSS 安全风险之下！
    */
   abstract bypassSecurityTrustResourceUrl(value: string): SafeResourceUrl;
 }