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....

n.牢固( fastness的名词复数 )，固定，要塞，堡垒...

fastnesses的音标：...