铜半圆规
brass semi-circular protractor
500t半圆体
500 t semi-circular cylinder
LR-半正规半群
LR-semi-normal semi-group
LR-拟正规－Ehresmann半群
LR-quasinormal-Ehresmann semigroup
凹半圆铣刀
half-round concave milling cutter
半规管手术
the semicircular canals surgery
半规管外侧凸
Prominentia canalis semicircularis lateralis
半规管阻塞
semicircular canal occlusion
半规则观测系统
semi-inerratic field setup