[zh-cn] Updated _index.md

Signed-off-by: Gao Qian <gaoq.jy@fujitsu.com>

content/zh-cn/docs/concepts/containers/_index.md

@@ -3,7 +3,6 @@ title: "容器"
 weight: 40
 description: 打包应用及其运行依赖环境的技术。
 content_type: concept
-no_list: true
 ---
 
 <!-- overview -->
@@ -14,6 +13,11 @@ run it.
 
 Containers decouple applications from underlying host infrastructure.
 This makes deployment easier in different cloud or OS environments.
+
+Each {{< glossary_tooltip text="node" term_id="node" >}} in a Kubernetes
+cluster runs the containers that form the
+[Pods](/docs/concepts/workloads/pods/) assigned to that node.
+Containers in a Pod are co-located and co-scheduled to run on the same node.
 -->
 每个运行的容器都是可重复的；
 包含依赖环境在内的标准，意味着无论你在哪里运行它都会得到相同的行为。
@@ -21,6 +25,10 @@ This makes deployment easier in different cloud or OS environments.
 容器将应用程序从底层的主机设施中解耦。
 这使得在不同的云或 OS 环境中部署更加容易。
 
+Kubernetes 集群中的每个{{< glossary_tooltip text="节点" term_id="node" >}}都会运行容器，
+这些容器构成分配给该节点的 [Pod](/zh-cn/docs/concepts/workloads/pods/)。
+单个 Pod 中的容器会在共同调度下，于同一位置运行在相同的节点上。
+
 <!-- body -->
 <!--
 ## Container images
@@ -29,31 +37,40 @@ software package, containing everything needed to run an application:
 the code and any runtime it requires, application and system libraries,
 and default values for any essential settings.
 
-By design, a container is immutable: you cannot change the code of a
-container that is already running. If you have a containerized application
-and want to make changes, you need to build a new image that includes
-the change, then recreate the container to start from the updated image.
+Containers are intended to be stateless and
+[immutable](https://glossary.cncf.io/immutable-infrastructure/):
+you should not change
+the code of a container that is already running. If you have a containerized
+application and want to make changes, the correct process is to build a new
+image that includes the change, then recreate the container to start from the
+updated image.
 -->
 
 ## 容器镜像 {#container-images}
 [容器镜像](/zh-cn/docs/concepts/containers/images/)是一个随时可以运行的软件包，
 包含运行应用程序所需的一切：代码和它需要的所有运行时、应用程序和系统库，以及一些基本设置的默认值。
 
-根据设计，容器是不可变的：你不能更改已经运行的容器的代码。
-如果有一个容器化的应用程序需要修改，则需要构建包含更改的新镜像，然后再基于新构建的镜像重新运行容器。
+容器旨在设计成无状态且[不可变的](https://glossary.cncf.io/immutable-infrastructure/)：
+你不应更改已经运行的容器的代码。如果有一个容器化的应用程序需要修改，
+正确的流程是：先构建包含更改的新镜像，再基于新构建的镜像重新运行容器。
 
 <!-- ## Container runtimes -->
 ## 容器运行时  {#container-runtimes}
 
 {{< glossary_definition term_id="container-runtime" length="all" >}}
 
-## {{% heading "whatsnext" %}}
 <!--
-* Read about [container images](/docs/concepts/containers/images/)
-* Read about [Pods](/docs/concepts/workloads/pods/)
+Usually, you can allow your cluster to pick the default container runtime
+for a Pod. If you need to use more than one container runtime in your cluster,
+you can specify the [RuntimeClass](/docs/concepts/containers/runtime-class/)
+for a Pod to make sure that Kubernetes runs those containers using a
+particular container runtime.
+
+You can also use RuntimeClass to run different Pods with the same container
+runtime but with different settings.
 -->
+通常，你可以允许集群为一个 Pod 选择其默认的容器运行时。如果你需要在集群中使用多个容器运行时，
+你可以为一个 Pod 指定 [RuntimeClass](/zh-cn/docs/concepts/containers/runtime-class/)，
+以确保 Kubernetes 会使用特定的容器运行时来运行这些容器。
 
-* 进一步阅读[容器镜像](/zh-cn/docs/concepts/containers/images/)
-* 进一步阅读 [Pods](/zh-cn/docs/concepts/workloads/pods/)
-
-
+你还可以通过 RuntimeClass，使用相同的容器运行时，但使用不同设定的配置来运行不同的 Pod。