垂直强迫振动
vertically forced oscillation
forced vertically oscillation
等强直螺纹
straight thread
uniform strength straight threads
uniform strength
地磁垂直强度
magnetic vertical intensity
关节强直
Joint ankylosis
Temporomandibular joint ankylosis
Ankylosis of temporomandibular joint
Tempor omandibular joint
ankylosis
arthrokleisis