fastness

['fæstnis]

n.要塞,城堡,坚固,不褪色, 快速,偏远的地方

例句与用法：

We guarantee the fastness of these dyes.

我们担保这些染料不褪色。

详细释义：

n.

1. 牢固; (颜色)不褪色[U]

We guarantee the fastness of these dyes.

我们担保这些颜料不褪色。

2. 据点; 堡垒[C]

The rebels have withdrawn to their mountain fastness for the winter.

叛军撤至他们的山寨过冬。