fastness

英 ['fɑ?s(t)n?s] 美['f?stn?s]
  • n. 牢固；不褪色；要塞；鞏固；堡壘；迅速

英英釋意

1. a rate (usually rapid) at which something happens;
"the project advanced with gratifying speed"
2. the quality of being fixed in place
3. a strongly fortified defensive structure