This lightweight hand-held instrument is an effective warning device for staff working in areas that can contain combustible gases.

这种轻型手持式测试仪对在可能存在易燃气体区域内工作的人员来说是有效的可燃气体警报装置。

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This paper introduces improved design of signal warning device on active naval vessels.

本文介绍了现役舰船信号报警装置的改进设计。

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The design and realization of chip type aircraft-borne sound-warning device are introduced.

介绍了基于微控制器的芯片式机载语音告警器的设计和实现。

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Ratings are often stale and fail to function as an early warning device.

FORBES: Sovereign Credit Ratings: Relics Of A Bygone Era

In the video, the major appears to be upbraiding the soldier for not using a laser warning device to signal the approaching truck.

NPR: Insider Attack Kills 2 US Troops, 2 Afghans

Vehicle inspector John Cripps, who later looked at the lorry from inside the cab, told the inquest he turned down its loud radio and could then hear the handbrake warning device.

BBC: Northampton