Fortress /ˈfɔːr.trəs/ n. 城堡;堡垒;要塞;
meaning: a large, strong building or group of buildings that can be defended from attack
1) 词根:fort-力量,强大(comfortable 舒服的)
2) 后缀:-ess 名词后缀(mattress 床垫;actress 女演员)
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