1. The rebels have withdrawn to their mountain fastness for the winter.
    叛军撤至他们的山寨过冬。

2. We guarantee the fastness of these dyes.
    我们担保这些颜料不褪色。

1. danci.edu.pub

1. 坚牢度：并且当C.I.颜料蓝15:6和C.I.颜料紫23结合作为颜料时,能够形成蓝色像素,该像素具有优越的光谱透射率特性和高鲜艳度(vividness)、亮度和透明度,以及各种最优越的坚牢度(fastness)性质,例如耐光性、

2. 牢度：并且当C.I.颜料蓝15:6和C.I.颜料紫23结合作为颜料时,能够形成蓝色像素,该像素具有优越的光谱透射率特性和高鲜艳度(vividness)、亮度和透明度,以及各种最优越的坚牢度(fastness)性质,例如耐光性、

3. 迅速;牢固;不褪色：fastmultiplier 快速乘法器 | fastness 迅速;牢固;不褪色 | fastnesstoalkali 耐碱度

4. 牢固：fastish 爱快速的 | fastness 牢固 | fastopen 快速打开文件

1. 堡垒;要塞
    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.

    e.g. They could have withdrawn into the mountain fastness of Eryri.
           他们本可退到山中要塞埃利里去。

1. a strongly fortified defensive structure

    Synonym: stronghold

2. the quality of being fixed in place as by some firm attachment

    Synonym: fixednessfixityfixturesecureness

3. a rate (usually rapid) at which something happens

    e.g. the project advanced with gratifying speed

    Synonym: speedswiftness