单词：patent fee
patent fee的用法和样例：
例句
- If the fees are not paid, then the patent is said to have lapsed.如果不付专利费，这项专利就告失效。
- Now, so far as obligations are concerned, the patent owner must pay an annual fee for his patent.至于义务，专利权人每年必须缴纳专利费。
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