Merge pull request #32439 from my-git9/namespace-1

[zh] Update namespace.md

content/zh/docs/reference/glossary/namespace.md

@@ -4,7 +4,7 @@ id: namespace
 date: 2018-04-12
 full_link: /zh/docs/concepts/overview/working-with-objects/namespaces/
 short_description: >
-  名字空间是 Kubernetes 为了在同一物理集群上支持多个虚拟集群而使用的一种抽象。
+  名字空间是 Kubernetes 用来支持隔离单个集群中的资源组的一种抽象。
 
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 tags:
@@ -18,7 +18,7 @@ id: namespace
 date: 2018-04-12
 full_link: /docs/concepts/overview/working-with-objects/namespaces/
 short_description: >
-  An abstraction used by Kubernetes to support multiple virtual clusters on the same physical cluster.
+  An abstraction used by Kubernetes to support isolation of groups of resources within a single cluster.
 
 aka: 
 tags: