在订阅了某个频道后，客户端和服务器间的连接会保持打开状态，并保持一段事先定义好的时间。
After a subscription to a channel, the connection between the client and the server is kept open, for a defined amount of time.
在订阅了某个频道后，客户端和服务器间的连接会保持打开状态，并保持一段事先定义好的时间。
After a subscription to a channel, the connection between the client and the server is kept open, for a defined amount of time.
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