bow
... bourdon tube布尔顿管 bow凹度 bow compasses弹簧圆规 ...
hollowness
... hollowmast空心桅 hollowness凹度 hollowness凹度空心度 ...
impression
... 强制变位imposeddisplacement 压痕,凹度impression 内侧鞍座辅索眼板inboardsaddlepreventerpadeye ...
[光] concavity
凹度
cambering
disk dish