... To wear protective masks必须戴防护面罩 Use protective devices必须用防护装置 Must shield必须用防护屏 ...
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use protective devices
使用保护装置
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Respiratory protective devices - Compressed air line breathing apparatus for use with a full face mask, half mask or a mouthpiece assembly - Requirements, testing, marking.
呼吸保护装置。与全罩式面罩、半罩式面罩或口罩一起使用的压缩空气导管呼吸装置。要求、试验和标志。
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Protective devices that use sound instead of bullets are an emerging opportunity.
FORBES: The Gun Industry Needs to Reinvent Itself Before It's Too Late
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