| 词汇 | keystone mask |
| 释义 | Definition of keystone mask in English:keystone masknoun Architecture
OriginMid 19th century; earliest use found in John Timbs (1801–1875), author. Definition of keystone mask in US English:keystone masknoun Architecture
OriginMid 19th century; earliest use found in John Timbs (1801–1875), author. |
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