短語詞組短語tangent cut point 切割點corner tangent point 角隅切點Tangent at This Point 於此點的切線tangent point tracing 切點跟蹤tangent from external point 切線長定理tangent point retarder 的繙譯是正切點阻滯劑;直線點緩行器common tangent point 公切點critical tangent point 臨界切點circular curve tangent point 圓曲線切點 返回 tangent point