Merge pull request envoyproxy#148 from scilla0531/zh_trans_terminology

zh-translation: docs/root/intro/arch_overview/intro/terminology.rst

docs/root/intro/arch_overview/intro/terminology.rst

@@ -1,32 +1,18 @@
-Terminology
+术语
 ===========
 
-A few definitions before we dive into the main architecture documentation. Some of the definitions
-are slightly contentious within the industry, however they are how Envoy uses them throughout the
-documentation and codebase, so *c'est la vie*.
+在深入研究主架构文档之前本文介绍一些定义。部分定义在行业中略有争议，但是在整个文档和代码库中，Envoy 就是这么使用的，所以，我们就这样定义吧。
 
-**Host**: An entity capable of network communication (application on a mobile phone, server, etc.).
-In this documentation a host is a logical network application. A physical piece of hardware could
-possibly have multiple hosts running on it as long as each of them can be independently addressed.
+**主机（Host）**: 能够进行网络通信的实体（如移动设备、服务器上的应用程序）。在此文档中，主机是逻辑网络应用程序。一块物理硬件上可能运行有多个主机，只要它们是可以独立寻址的。
 
-**Downstream**: A downstream host connects to Envoy, sends requests, and receives responses.
+**下游（Downstream）**: 下游主机连接到 Envoy，发送请求并接收响应。
 
-**Upstream**: An upstream host receives connections and requests from Envoy and returns responses.
+**上游（Upstream）**: 上游主机接收来自 Envoy 的连接和请求，并返回响应。
 
-**Listener**: A listener is a named network location (e.g., port, unix domain socket, etc.) that can
-be connected to by downstream clients. Envoy exposes one or more listeners that downstream hosts
-connect to.
+**监听器（Listener）**: 监听器是被命名的网络地址（例如，端口、Unix 域套接字等)，它可以被下游客户端连接。Envoy 给下游主机暴露一个或多个监听器来连接。
 
-**Cluster**: A cluster is a group of logically similar upstream hosts that Envoy connects to. Envoy
-discovers the members of a cluster via :ref:`service discovery <arch_overview_service_discovery>`.
-It optionally determines the health of cluster members via :ref:`active health checking
-<arch_overview_health_checking>`. The cluster member that Envoy routes a request to is determined
-by the :ref:`load balancing policy <arch_overview_load_balancing>`.
+**集群（Cluster）**: 集群是指 Envoy 连接到的逻辑上相同的一组上游主机。Envoy 通过 :ref:`服务发现 <arch_overview_service_discovery>` 来发现集群的成员。可以选择通过 :ref:`主动健康检查 <arch_overview_health_checking>` 来确定集群成员的健康状态。Envoy 通过 :ref:`负载均衡策略 <arch_overview_load_balancing>` 来决定将请求路由到哪个集群成员。
 
-**Mesh**: A group of hosts that coordinate to provide a consistent network topology. In this
-documentation, an “Envoy mesh” is a group of Envoy proxies that form a message passing substrate for
-a distributed system comprised of many different services and application platforms.
+**网格（Mesh）**: 一组协调提供一致网络拓扑的主机。在本文档中，“Envoy 网格”是一组 Envoy 代理，它们构成了分布式系统的消息传递基础，这个分布式系统由很多不同服务和应用程序平台组成。
 
-**Runtime configuration**: Out of band realtime configuration system deployed alongside Envoy.
-Configuration settings can be altered that will affect operation without needing to restart Envoy or
-change the primary configuration.
+**运行时配置（Runtime configuration）**:  外置实时配置系统和 Envoy 一起部署。可以更改配置设置来影响运行，而无需重启 Envoy 或更改主要配置。