堡壘
fort;fortress;bulwark;stronghold;blockhouse;citadel;castle
～是最容易從內(nèi)部攻破的。A fortress is most vulnerable when attacked from within./反對種族隔離運動的～bulwark of anti-apartheid movement/殖民主義的最后～last stronghold(or citadel) of colonialism/革命的～ bulwark of revolution/頑固～ stronghold of conservatism/～政策policy of blockhouse warfare/～主義policy (or principle) of blockhouse warfare/～主義的戰(zhàn)略strategy of building blockhouses