ultimum

例句：

1. 1. The project has an ultimatum due in three days.
   这个项目有一个最后期限，将在三天后到期。
2. 2.The company's ultimatum was to cease all operations by the end of the month.
   公司的最后通牒是月底前停止所有运营。
3. 3. The ultimatum was clear: no further negotiations were allowed.
   最后通牒明确指出：不允许进一步的谈判。