System safety design controls safety of datum from three aspects, " physics level ", " system level " and " data level "

系统安全设计从「 物理层」 、 「系统层」 、 「数据层」三个方面对数据的安全性进行了控制。

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It controls the traffic lights and ensures the safety of the people getting in and out of the stadium.

它控制交通灯，确保获得进出体育场馆的人群安全。

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However, xenotransplantation is also carried out in countries that lack such oversight and where materials and procedures used have not undergone any quality and safety controls.

但是，一些缺乏这种监督，使用的材料和做法未经任何质量和安全控制的国家也在开展异种移植。

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The tiny outfits were in a much better position to skirt environmental controls and safety standards for products and workers.

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Steady advances in automation and robotics are now invisibly encapsulated in navigation, weather avoidance, traffic management, flight controls, safety and communications aids that materially benefit the two-pilot front cabin.

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But such safety controls didn't prevent a fire from breaking out in February 2010.

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