片语
quoin用楔子固定
Exterior Opposite Angle Area外部对角映射区
exterior angle of a triangle三角形的外角
alternate exterior angle外错角
exterior angle cracks外角裂缝
external angle[数] 外角
alternate e exterior angle外错角
exterior of simple polyhedral angle简单多面角的外部
exterior r angle外角
exterior of a trihedral angle三面角的外部
Aussenwinkel exterior angle外角