名词
中文翻译：专利证书
同义词：
['patent', 'patent certificate']
例句：
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1.The company has applied for several letters patent in recent years.
该公司近年来申请了多项专利。
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2. The invention was awarded a letters patent by the government.
这项发明被授予政府的一项专利。
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3. The patent protects the company's intellectual property rights.
这项专利保护了公司的知识产权。