This means you can give regular requests a short lifetime, but you can also extend this lifetime to several minutes for a mechanism that responds to long polling requests.
这意味着可以给常规的请求设置很短的生命周期，但是对于响应长轮询请求的机制，也可以将这个生命周期延长至几分钟。
Since the beginning of the Internet, if you wanted to sync services between two servers the most common solution was to have the client ping the host at regular intervals, which his known as polling.
自从互联网开始起来，如果你想要同步两个服务器之间的服务，最通常的解决方案是让客户端以规律的间隔来ping服务器，这就是人们所知的轮询。
Polling: Client keeps polling the server at regular intervals.
轮询：客户端定期轮询服务器。
Polling: the collector is invoked on a regular frequency, and it retrieves and traces the current value of a metric or set of metrics from a PDS.
轮询：按固定频繁调用收集器，它将检索和跟踪PDS中的指标或指标集的当前值。
Polling: the collector is invoked on a regular frequency, and it retrieves and traces the current value of a metric or set of metrics from a PDS.
轮询：按固定频繁调用收集器，它将检索和跟踪PDS中的指标或指标集的当前值。
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