设备代理可以在轮流检测的间隔或设备启动后的任何时刻(或两种条件同时满足)查询等待执行的作业，这依赖于所处的环境。
Depending on the environment, the device agent may poll for waiting jobs at a polling interval, or whenever the device is powered on, or both.
这是趋同进化的一个例子：间隔十万八千里，基因不同的物种，为了适应相似的外部环境，越来越趋于同质化了。
In an example of what's known as convergent evolution, geographically isolated and genetically distinct species developed similar characteristics because they were adjusting to similar environments.
轮询间隔的缺省值为30秒，适合于初始测试或小型生产环境。
The default value for the polling interval is 30 seconds and is appropriate for initial testing or for small production environments.
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