名词中文翻译
中文翻译：主要防护盾
同义词：
['primary defense', 'primary barrier例句：1. The primary shield of the city is its public transportation system.（城市的首道防线是其公共交通系统。）']
例句：
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1. The primary shield of the city is its public transportation system.
城市的首道防线是其公共交通系统。
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2. The primary shield against disease is vaccination.
预防疾病的首要手段是疫苗接种。
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3. The primary shield for their homeland's security is a well-trained military force.
他们国家安全的首要防线是一个训练有素的军队。