名词
中文翻译：合同
同义词：
['agreement', 'contract', 'agreement', 'pact']
例句：
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1.The company signed a new COA with the government last month.
公司上个月与政府签订了一份新的合约。
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2.He had to sign the COA before he could start working.
他必须在开始工作前签署合约。
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3. The COA stipulates that both parties must fulfill their obligations within a certain time frame.
合约规定双方必须在特定时间内履行其义务。