动词短语
中文翻译：在文件上盖章
同义词：
['Sign', 'stamp', 'affix seal to']
例句：
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1. The official document must be signed by the head of the department.
该官方文件必须由部门负责人签署。
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2. Before leaving the country, we need to have our passports stamped with the customs office.
离开该国前，我们需要在海关办公室盖章签证。
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3. After the meeting, the director signed off on the project proposal.
会议结束后，总监在项目提案上盖章确认。