siege mentality
noun [ S ] disapproving uk/ˈsiːdʒ menˌtæl.ə.ti/ us/ˈsiːdʒ menˌtæl.ə.t̬i/
受围心态，自我封闭
a feeling that makes you frightened of people around you, and causes you not to trust them
Years of international isolation has led the country to develop a siege mentality. 多年的国际封锁导致这个国家封闭排外。