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半圆键
auto.
circular key
;
half moon key
(woodruff key)
;
half-round key
;
semicircular key
;
semi-round key
met.
semi-circular key
;
woodruff key
tech.
Whitney key
半圆〔月形〕键
mech.eng.
woodruff key
半圆键:
3 phrases
in 2 subjects
Construction
1
Technology
2
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