n.牢固；固定；要塞；堡垒 变形： 复数：fastnesses 英英释义： fastness[ 'fɑ:stnis, 'fæs- ]n.a rate (usually rapid) at which something happens同义词：speedswiftnessthe quality of being fixed in place as by some firm attachment同义词：fixednessfixityfixturesecurenessa strongly fortified d