名词短语
中文翻译：附加安全
同义词：
['extra security', 'additional security']
例句：
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1.The hotel offers a range of add-on services to enhance your stay experience.
这家酒店提供一系列附加服务，以提升您的住宿体验。
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2. The company's new product line includes an add-on security feature that protects against unauthorized access.
该公司的新产品线包括一个附加的安全特性，可以防止未经授权的访问。
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3.The package includes a free add-on security service for the first year.
该套餐包含一年免费的附加安全服务。