动词
中文翻译：签署
同义词：
['sign', 'seal', 'stamp', 'affix', 'emboss']
例句：
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1. The document needs to be officially signed by the representative.
这份文件需要由代表正式签署。
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2. The signature of the president is required for approval.
总统的签名是批准所必需的。
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3. The official seal was impressed on the envelope before it was sent.
官方印章在信封上压印后才被发送。