key-stone

英 ['kiːst'əʊn] 美 ['kiːst'əʊn]

• 填缝石

key-stone的英文翻译是什么意思，词典释义与在线翻译：

英英释义

名词 keystone:

1. a central cohesive source of support and stability

2. the central building block at the top of an arch or vault