常见例句雙語例句Methods To adopt screw expansion appliance to gradually expand posterior and anterior dental arch with 18~33 day activation and 3~6 month retainment.方法採用螺鏇擴大矯治器進行前牙和後牙的擴弓，加力18～33天，戴用保持器3～6個月。 返回 anterior expansion arch