因此1米长的钟摆，所用周期是2秒。
So a pendulum one meter long has a period of about two seconds.
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。
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.
农业的长周期性很少会引起人们对它的焦虑。
THE long cycles of agriculture are seldom associated with gripping suspense.
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