fastnesses
n. 牢固( fastness的名词复数 ); 固定; 要塞; 堡垒
A fastness is a place, such as a castle, which is considered safe because it is difficult to reach or easy to defend against attack.
They could have withdrawn into the mountain fastness of Eryri.
他们本可退到山中要塞埃利里去。
Disperse dyes are suitable for dyeing PU fiber, high uptake and satis factory fastnesses were observed.
分散染料是氨纶染色的理想染料, 它具有较高的上染率和较好的染色牢度.