名词
中文翻译：签字者
同义词：
['signatory', 'signator']
例句：
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1.The cosigner of the contract is responsible for signing it.
合同的签字人是负责签字的人。
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2.The cosigner of the agreement must be present at the meeting.
协议的签字人必须在会议上出席。
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3. The cosigner of the signature is required to provide a copy of their identification.
签字人的签名需要提供身份证明副本。