diff --git a/aio/content/start/start-data.md b/aio/content/start/start-data.md
index 700ccb3694..7de86ead3f 100644
--- a/aio/content/start/start-data.md
+++ b/aio/content/start/start-data.md
@@ -32,13 +32,18 @@ This step of the tutorial guides you through creating a shopping cart in the fol
In Angular, a service is an instance of a class that you can make available to any part of your application using Angular's [dependency injection system](guide/glossary#dependency-injection-di "Dependency injection definition").
-
+在Angular中, 服务是一个类的实例, 通过Angular的[依赖注入系统](guide/glossary#dependency-injection-di "Dependency injection definition")能在你的应用中的任意部分使用。
Currently, users can view product information, and the application can simulate sharing and notifications about product changes.
+ 到目前为止, 用户可以浏览产品信息, 并且应用可以模拟分享产品和通知产品改变。
+
The next step is to build a way for users to add products to a cart.
This section walks you through adding a **Buy** button and setting up a cart service to store information about products in the cart.
+下一步是为用户提供一种添加产品到购物车到方法。
+这个章节将带领你添加一个 **购买** 按钮并且建立起一个购物车服务以储存购物车中的产品信息。
+
{@a generate-cart-service}
### Define a cart service
@@ -107,9 +112,20 @@ This section walks you through using the `CartService` to add a product to the c
The `addToCart()` method does the following:
+
+ `addToCart()` 方法做了如下事情:
+
* Takes the current `product` as an argument.
+
+ 以当前'product'作为参数。
+
* Uses the `CartService` `addToCart()` method to add the product the cart.
+
+ 使用 `CartService` `addToCart()` 方法去添加产品到购物车中。
+
* Displays a message that you've added a product to the cart.
+
+ 显示一条你已经添加了一个产品到购物车到消息。
1. In `product-details.component.html`, add a button with the label **Buy**, and bind the `click()` event to the `addToCart()` method.
This code updates the product details template with a **Buy** button that adds the current product to the cart.
@@ -297,6 +313,8 @@ Use this data to add shipping prices for items in the cart.
### Configure `AppModule` to use `HttpClient`
+### 配置 `AppModule` 以使用 `HttpClient`
+
To use Angular's `HttpClient`, you must configure your application to use `HttpClientModule`.
要使用 Angular 的 HTTP 客户端之前，你必须先配置你的应用来使用 `HttpClientModule`。
@@ -324,8 +342,12 @@ Angular 的 `HttpClientModule` 中注册了在整个应用中使用 `HttpClient`
### Configure `CartService` to use `HttpClient`
+### 配置 `CartService` 以使用 `HttpClient`
+
The next step is to inject the `HttpClient` service into your service so your application can fetch data and interact with external APIs and resources.
+下一步是注入 `HttpClient` 服务到你的服务中, 这样你的应用可以获取数据并且与外部API和资源互动。
+
1. In `cart.service.ts`, import `HttpClient` from the `@angular/common/http` package.
从 `@angular/common/http` 包中导入 `HttpClient`。
@@ -342,8 +364,12 @@ The next step is to inject the `HttpClient` service into your service so your ap
### Configure `CartService` to get shipping prices
+### 配置 `CartService` 以得到商品价格
+
To get shipping data, from `shipping.json`, You can use the `HttpClient` `get()` method.
+要从 `shapping.json` 中得到商品数据, 你可以使用 `HttpClient` `get()` 方法。
+
1. In `cart.service.ts`, below the `clearCart()` method, define a new `getShippingPrices()` method that uses the `HttpClient` `get()` method.
在 `cart.service.ts` 中 `clearCart()` 方法下面，定义一个新的 `getShippingPrices()` 方法，该方法会调用 `HttpClient#get()` 方法。
@@ -382,8 +408,12 @@ Now that you've configured your application to retrieve shipping data, you can c
### Configuring the `ShippingComponent` to use `CartService`
+### 配置 `ShippingComponent` 以使用 `CartService`
+
This section guides you through modifying the `ShippingComponent` to retrieve shipping data via HTTP from the `shipping.json` file.
+这个章节将指导你修改 `ShappingComponent` 以通过HTTP从 `shipping.json` 文件中提取商品数据。
+
1. In `shipping.component.ts`, import `CartService`.
@@ -446,6 +476,8 @@ This section guides you through modifying the `ShippingComponent` to retrieve sh
## What's next
+### 下一步
+
You now have a store application with a product catalog, a shopping cart, and you can look up shipping prices.
现在你有了一个带有商品名录和购物车的商店应用了，而且你还可以查询运费。