一成不变

This distinction isn't hard and fast.

这样的差别并非是一成不变的。

Undiversified tobacco companies stand to lose if there were a mass migration to smokeless products like Snus.

如果有大量的如鼻烟这样的无烟烟草产品流入，一成不变的烟草公司将亏损。

I suddenly realized one day that I’d been in a rut for years: same job, same flat, same friends, same holiday every year …

突然有一天我意识到我已经过了好多年一成不变的生活：同样的工作，同样的公寓，同样的朋友，每年度的假也一样?

FOR MOST OF ITS 100-YEAR HISTORY, NEUROSCIENCE has embraced a central dogma: a mature adult's brain remains a stable, unchanging, computerlike machine with fixed memory and processing power.

经科学100年的历史当中，大多信奉著一个中心思想：成年人的脑子是个稳定、不变、如计算机般的机器，有著一成不变的记忆与资讯处理能力。

In the morning, when we were already at the dock in Cienaga, my grandfather stood shaving with his straight razor, the door open and the mirror hanging from the frame.

他还没穿衬衫，但是在汗衫上系了他一成不变的吊裤带，宽宽的，带着绿色条纹。刮胡子的时候他不一名男子说话，我现在还能一眼认出那个人来。

Each individual’s youth faithfully repeats that of his forebears, introducing him to a role that lives on unchanged: it is a “pre-scribed” youth, which, to quote Mannheim again, knows no “entelechy.

每一个个体的青年时期忠实重复着他祖先的足迹，使他成为一个一成不变的角色：这是模仿前辈的年轻，再次引用曼海姆的话，叫做没有“实体”的年轻。