名词
中文翻译：Unknown
同义词：
['protective gear', 'safety measure', 'surveillance equipment']
例句：
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1. The soldier was wearing a protective vest to guard against the heat.
士兵穿着一件防护背心来抵御高温。
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2. The police used surveillance equipment to monitor the area for suspicious activity.
警方使用监控设备来监视该区域，以防可疑活动。
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3. The engineers were using a guard gauge to ensure the bridge's stability.
工程师们正在使用一个测量仪来确保桥梁的稳定性。