confocal cones共焦: confocal共焦: confocal◇共焦曲线 confocal curves; 共焦坐标 confocal coordinates聚焦锥: focon; focusing cone锥面: cone; conical surface; pyramidal face; tapered face ring共焦系, 共焦族: confocal family下载手机词典可随时随地查词查翻译