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to phrases
key stone
archit.
拱顶
心
石
;
填缝石
;
嵌缝石
met.
中心石
;
拱顶石
tech.
冠石
;
拱顶中心石
key-stone
bridg.constr.
填缝石
;
楔石
tech.
拱心石
;
拱顶石
key- stone
:
2 phrases
in 1 subject
Bridge construction
2
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