影视英语口语:已成定局

“已成定局”在英语口语里能怎么说？

蹩脚口语：be settled
地道口语：here to stay

影视来源：奥斯卡热门《第九区》
剧情引导：
不知从哪里来的巨大飞船，人们打开舱门后发觉了其中有好多惨不忍睹的外星人。他们就此在地球上驻扎了下来，却耗费大量人力物力。专家们说，外星人回不去了......

- They're spending so much money to keep them here when they could be spending it on other things. But at least at least they're keeping them separate from us.
- I wanna be realistic with everyone. The aliens will not be able to go home.
- The aliens are here to stay.