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半圆头螺钉
archit.	button head screw
auto.	half-round headed screw
tech.	button-headed screw; button-head screw; cup head screw; half-round head screw; half-round screw; snap head screw
半平圆头螺钉
auto.	slotted round head screw

半 圆头螺钉: 6 phrases in 2 subjects

Architecture	2
Technology	4