堡垒 bǎolěi HSK7 fortress Origin Definitions Defs Strokes Stroke Words Sentences Sents 堡垒机 bǎolěijī bastion host (computing) a security-hardened server used to manage access to a private network; jump server空中堡垒 kōngzhōngbǎolěi flying fortress A giant military aircraft, such as the American B-29 bomber used at the end of World War II.