名词
中文翻译：Unknown
同义词：
['疫苗，防护措施，保护程序例句：1. The PPD vaccine is recommended for children under the age of 12.（建议12岁以下儿童接种PPD疫苗。）']
例句：
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1. 预防针
通常指疫苗
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1. The PPD vaccine is recommended for children under the age of 12.
建议12岁以下儿童接种PPD疫苗。
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2.The company has implemented several protective measures to prevent the spread of the virus.
该公司已采取多项防护措施以防止病毒传播。
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3.The PPD treatment is an essential part of the recovery process.
PPD治疗是康复过程的重要组成部分。