英语语法分析

Roman builders perfected the semicircular arch made of separate blocks of stone.

罗马的建造者完善了由不同的石块构成的半圆形拱门。

SCDS can occur when some part of the bone protecting the superior semicircular canal is missing.

当保护上半规管的部分骨头缺失时，SCDS就会发生。

Located within the labyrinth are three semicircular canals that act as angular accelerometers for the head.

在骨迷路上，有3个作为头部角加速度计的半规管。