名词
中文翻译：最后通牒
同义词：
['final demand', 'final offer', 'final demand clause', 'final offer clause']
例句：
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1. The companyhas made an ultimatum to the union that it will not negotiate with them unless they agree to a new contract.
公司向工会发出了最后通牒，除非他们同意新合同，否则将不会与他们进行谈判。
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2. The government has issued an ultimatum demanding immediate payment of taxes owed.
政府已经发出最后通牒，要求立即支付所欠税款。
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3. The deadline for submitting the proposal is tomorrow, and we have only two days left before it expires.
提交提案的最后期限是明天，我们只剩下两天的时间了。