ZH-trans: add Update define-environment-variable-container.md (#11859)

* Update define-environment-variable-container.md

* Update define-environment-variable-container.md

* Update define-environment-variable-container.md

* Update define-environment-variable-container.md

* Update define-environment-variable-container.md

content/zh/docs/tasks/inject-data-application/define-environment-variable-container.md

@@ -30,32 +30,44 @@ content_template: templates/task
 
 1. 基于YAML文件创建一个Pod:
 
+    ```shell
     kubectl create -f https://k8s.io/docs/tasks/inject-data-application/envars.yaml
+    ```
        
 1. 获取一下当前正在运行的Pods信息:
 
+    ```shell
     kubectl get pods -l purpose=demonstrate-envars
+    ```
        
     查询结果应为:
     
+    ```shell
     NAME            READY     STATUS    RESTARTS   AGE
     envar-demo      1/1       Running   0          9s
+    ```
       
 1. 进入该Pod下的容器并打开一个命令终端:
     
+    ```shell
     kubectl exec -it envar-demo -- /bin/bash
+    ```
 
 1. 在命令终端中通过执行`printenv`打印出环境变量。
 
+    ```shell
     root@envar-demo:/# printenv
+    ```
     
     打印结果应为:
     
+    ```shell
     NODE_VERSION=4.4.2
     EXAMPLE_SERVICE_PORT_8080_TCP_ADDR=10.3.245.237
     HOSTNAME=envar-demo
     ...
     DEMO_GREETING=Hello from the environment
+    ```
         
 1. 通过键入`exit`退出命令终端。