N-COUNT
防护；壁垒
A bulwark against something protects you against it. A bulwark of something protects it.
例句
The abbeys were founded in the 12th century by King David as a bulwark against the English...
这些修道院是12世纪大卫王用来抵御英国人而修建的堡垒。
The House of Lords is the only bulwark of democracy in this country.
在这个国家，上议院是唯一的民主堡垒。