keystone
/ˈkiː.stəʊn/
The central stone in an arch.
“The keystone held the entire archway firmly in place.”
Thêm vào My Deck
inoh
inoh
/ˈkiː.stəʊn/
The central stone in an arch.
“The keystone held the entire archway firmly in place.”
Thêm vào My Deck