把一个小网关插件接入路由器，再让系统里的两台摄像头和互联网同步，不用下载也不用配置。
A small gateway plugs into a router and syncs up the system's two cameras and the Internet, no downloading or configuration required.
核心思路是把所有安全决策集中在网关，防止不希望出现的数据访问。
The core concept is to centralize all security decisions in the gateway and prevent unwanted data access.
传感器工作原理如下：传感器和一个绿色网关进行通信，然后网关把消息发送至网站。
Here's how the sensor part works: the sensors communicate with a "Green Gateway" that then sends messages to the web site.
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