bastion

1. N-COUNT If a system or organization is described as a bastion of a particular way of life, it is seen as being important and effective in defending that way of life. Bastion can be used both when you think that this way of life should be ended and when you think it should be defended. 堡垒; 精神支柱[正式]

...a town which had been a bastion of white prejudice. …一个曾经是白人偏见的堡垒的小镇。

...a bastion of spiritual freedom. …一座精神自由的堡垒。