"a place not easily forced, a stronghold," late Old English fæstnes "firmness, strongness, massiveness, stability; the firmament," from fast (adj.) in its older sense of "firm, fixed in place" + -ness.
权威例句
1. They could have withdrawn into the mountain fastness of Eryri.
他们本可退到山中要塞埃利里去。
2. The rebels have withdrawn to their mountain fastness for the winter.
叛军撤至他们的山寨过冬.
3. We guarantee the fastness of these dyes.
我们担保这些颜料不褪色.
4. To common joints, bolts fastness should start from center to outside.
对于一般接头, 应从螺栓群中间顺序向外侧进行紧固.
5. A . to the printer and printing ink adhesion fastness.