In this instance sample messages may be sent from robotic clients through the DataPower service to ensure that all network links (including load balancers) are operational.

对于应用程序监控，消息可能从自动化(robotic)客户端通过DataPower服务发送，以确保所有网络连接(包括负载平衡器)都是可操作的。

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The prominent National Longitudinal Lesbian Family Study, for instance, relied on a sample recruited entirely at lesbian events, in women's bookstores and through lesbian newspapers.

WSJ: Nelson Lund: A Social Experiment Without Science Behind It

Mr Heckman confronted the sample-selection problem: in terms of the examples just given, for instance, the effect on the results if the workers who answered the questionnaire differed in important ways from those who did not.

ECONOMIST: Economics focus