影视英语口语:一成不变

“一成不变”在英语口语里能怎么说？

蹩脚口语：unchangable
地道口语：set in stone

素材来源：《欢乐合唱团》

剧情简介：
威尔接管了学校破落的合唱团，雄心勃勃想要重树其辉煌，却受到资金和人员方面的重重压力，更有盛气凌人的啦啦队教练苏打压其热情。辅导员艾玛却好心建议，要招募成员必须擒贼先擒王……

Sue: High school is a caste system. Kids fall into certain slots. Your jocks, your popular kids, up in the penthouse. The invisibles and the kids playing live-action druids and trolls out in the forest... bottom floor.
Will: And... where do the Glee kids lie?
Sue: Sub-basement.
Emma: Sue's not wrong. But I don't think anything's set in stone. I mean. kids are gonna do what they think is cool. which is not always who they are. You just need to find a way to get them out of their boxes.
Will: Well, how do I do that?
Emma: They follow the leader. If you can get a couple of the popular kids to sign up the rest will fall right in line.