Artificial intelligent assistant

bastion

bastion
/ˈbæstɪən; `bæstɪən/ n
1 part of a fortification that projects from the rest 棱堡(防御工事的凸出部分).
2 military stronghold near enemy territory 临近敌区的军事据点.
3 (fig 比喻) person or thing defending or protecting sth that is threatened 堡垒; 保护者; 保卫者; 捍卫者
    a bastion of democracy, freedom, etc 捍卫民主、自由等的堡垒
    `The last bastions of privilege are crumbling,' announced the speaker. 演讲者宣称
    `特权制度的最後一个堡垒正在崩溃.

牛津英汉双解词典

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