动词
中文翻译：签名
同义词：
['mark', 'seal', 'certify', 'authenticate']
例句：
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1. He signed the contract before it was finalized.
他在合同最终确定之前签了字。
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2. The official document requires a signature from the president.
官方文件需要总统的签名。
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3. Before leaving, they signed the guest book.
离开前，他们签了客簿。