二圆公切线: common tangent of two circles内公切线: inner common tangent; inner tangent common; internal common tangent外公切线: external common tangent邻接曲线的公切线: continuous curve tangent邻接曲线公切线: contiguous curve tangent公切: common tangent; common tangetn切线: [数学] tangent (line)内公切面: internal common tangent plane外公切面: external common tangent plane半切线: semitangent裁切线: trim line次切线: subtangent单切线: simple tangent锋切线: front shear line拐切线: inflectional tangent横切线: cross cut; line transect剪切线: shear line; shearing line交切线: line of intersection内切线: inner tangent line切线，正切: tangent切线波: tangential wave切线长: length of tangent line; tangent distance tl; tangent length切线丛: tangent complex切线的: tangential公亲: kinchika公勤人员: service personnel in an office
