all but 几乎;差不多;除了…都

【例句】
The concrete wall that used to divide this city has now all but gone.
曾经将这座城市分隔开的混凝土墙现在已几乎不复存在。

Herbalism had become an all but extinct skill in the Western world.
草药医术在西方已经成了一门几乎绝迹的技艺。