名词
中文翻译：Unknown
同义词：
['unregistered', 'unregistered registration', 'underregistration']
例句：
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1. The company has been under-registration for several years.
该公司已经未登记注册了几年。
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2. The under-registration of the patents is a major problem in the industry.
专利的未登记注册是该行业的主要问题。
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3.The under-registration of the patents is a major problem in the industry.
专利的未登记注册是该行业的主要问题。