perpetratevt.做(坏事);犯(罪)
peroxiden.过氧化物
perpendicularlyadv.垂直地;笔直地;纵向地
perpendicular tovt.与 ... 垂直(垂直于)
perpendicularilyn.垂直地
perpendicularityn.垂直;直立
perpendicular cut(与轴成)垂直(截面)截割
"the axes are perpendicular to each other"
"a vertical camera angle"
"the monument consists of two vertical pillars supporting a horizontal slab"
"measure the perpendicular height"
"the great perpendicular face of the cliff"