fastness
/ˈfɑ:stnɪs; ?@ ˈfæs-; `fæstnɪs/ n[U]
quality of being fast2(2) 不褪色
We guarantee the fastness of these dyes. 我们担保这些染料不褪色.
fastness / ˈfɑ:stnɪs; ?@ ˈfæs-; `fæstnɪs/ n fortified place that is easily defended; stronghold 堡垒; 要塞
a mountain fastness 山寨.