名词
中文翻译：Unknown
同义词：
['subordinate protective barriers', 'secondary safety barriers', 'secondary protection measures']
例句：
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1. Thehospital installed secondary protective barriers to prevent the spread of the virus.
医院安装了次级防护屏障，以防止病毒的传播。
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2.The construction site had to install secondary protective barriers to ensure worker safety.
施工现场必须安装次级防护屏障，以确保工人的安全。
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3.In addition to primary protective barriers, secondary protective barriers are also necessary for preventing contamination.
除了一级防护屏障外，二级防护屏障也是防止污染所必需的。