单词：fastnesses
音标：[ˈfæstnɪsiz] ；
n. 牢固( fastness的复数形式 ); 固定; 要塞; 堡垒
n. a rate (usually rapid) at which something happens
n. the quality of being fixed in place as by some firm attachment
n. a strongly fortified defensive structure
n. the quality of being fixed in place as by some firm attachment
n. a strongly fortified defensive structure