Sync concepts/cluster-administration/networking.md

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Co-authored-by: Qiming Teng <tengqim@cn.ibm.com>

content/zh/docs/concepts/cluster-administration/networking.md

@@ -350,6 +350,18 @@ network complexity required to deploy Kubernetes at scale within AWS.
 复杂性（每个 VPC 限制为50-100个条目）。
 简而言之，cni-ipvlan-vpc-k8s 大大降低了在 AWS 中大规模部署 Kubernetes 所需的网络复杂性。
 
+<!--
+### Coil
+
+[Coil](https://github.com/cybozu-go/coil) is a CNI plugin designed for ease of integration, providing flexible egress networking.
+Coil operates with a low overhead compared to bare metal, and allows you to define arbitrary egress NAT gateways for external networks.
+
+-->
+### Coil
+
+[Coil](https://github.com/cybozu-go/coil) 是一个为易于集成、提供灵活的出站流量网络而设计的 CNI 插件。
+与裸机相比，Coil 的额外操作开销低，并允许针对外部网络的出站流量任意定义 NAT 网关。
+
 <!--
 ### Contiv
 
@@ -691,4 +703,3 @@ document](https://git.k8s.io/community/contributors/design-proposals/network/net
 网络模型的早期设计、运行原理以及未来的一些计划，都在
 [联网设计文档](https://git.k8s.io/community/contributors/design-proposals/network/networking.md)
 里有更详细的描述。
-