动词
中文翻译：签名
同义词：
['signature', 'seal', 'mark']
例句：
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1. He signed the contract with a pen and ink.
他用笔和墨水签署了合同。
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2. The official document was signed by the prime minister.
这份官方文件是由首相签署的。
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3. The signature of the witness is required for the case to proceed.
证人的签名是该案件继续进行所必需的。