fastness
n. 牢固；不褪色；要塞；巩固；堡垒；迅速
复数 fastnesses
例句
They could have withdrawn into the mountain fastness of Eryri.
他们本来可以撤回到艾瑞的山区要塞里。
《柯林斯英汉双解大词典》
We guarantee the fastness of these dyes.
我们担保这些染料不褪色。
The bandits withdrew to their mountain fastness for the winter.
盗匪们撤回到他们的山寨中准备过冬。
