bulwark [ˈbʊlwək]

以下由轻松背单词网站提供

n.堡垒，保障，防御

something that protects you from dangerous or unpleasant situations

That country is a bulwark of freedom. 那个国家是自由的堡垒。
Law and morality are the bulwark of society. 法律和道德是社会的防御工具。