Other expression · CEFR C2
spring stone
other_expression
拱脚石；拱的起拱石(拱的最下面一块石头)
- 1.
the lowest stone of an arch, from which the arch begins to rise; a springer
拱脚石；拱的起拱石(拱的最下面一块石头)
拱脚石；拱的起拱石(拱的最下面一块石头)
In use
The spring stone must be set precisely to support the rest of the arch.
Dictionary facts from AI_SUPPLEMENT.