This distinction isn't hard and fast.

这差别并非是一不变。

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

如果有大量如鼻烟这无烟烟草产品流入，一不变烟草公司将亏损。

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一不变生活：工作，公寓，朋友，每度假也一?

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历史当中，大多信奉著一个中心思想：脑子是个稳定、不变、如计算机般机器，有著一不变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不变吊裤带，宽宽，带着绿色条纹。刮胡子时候他不停地跟一名男子说话，我现在还能一眼认出那个来。

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.

每一个个体青时期忠实地重复着他祖先足迹，使他为一个一不变角色：这是模仿前辈轻，再次引用曼海姆话，叫做没有“实体”轻。