Once detected, the wearers are swarmed.

一旦检测到，配戴者都蜂拥。

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Paper defects of such a nature was once detected on our newsprint. The problem was eventually solved. Measures taken are presented in this paper.

本文阐述了该厂新闻纸纸机上曾经出现这种纸病的原因及危害性，并且介绍了解决的措施及应注意的问题。

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Harmful information, once detected, shall be reported immediately to relevant competent authorities and effective measures shall be taken to prevent it from being spread.

发现有害信息应当及时向有关主管部门报告，并采取有效措施，不得使其扩散。

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This is easy to detect, and once detected, human intervention becomes possible.

ECONOMIST: A new way of thwarting viral epidemics on computers

Once a vein is detected at a suitable depth, the device alerts the operator, who pushes the syringe needle into the patient's flesh and injects the medicine.

ECONOMIST: Medical technology

Once the issue was detected, the sensing equipment operated as designed and opened a breaker, causing power to be partially cut to the Superdome in order to isolate the issue.

FORBES: The Super Bowl Blackout: "An Abnormality In The System"