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半圆拱
gen.	full-center arch
archit.	full-centred arch
bridg.constr.	full centered arch; half-round arch; semicircular arch; Roman arch; full centre arch
hydroel.st.	semi-circular arch; full-centered arch; cylindric vault; cylindrical vault
tech.	compass-headed arch; cylindric vault (顶); cylindrical vault (顶); round arch
半圆形拱
tech.	semi-circular arch

半圆拱: 38 phrases in 4 subjects

Architecture	9
Bridge construction	2
Electronics	1
Technology	26