corrective operation of pectus exca vatum

例句：

1. 1. The doctor used a corrective device to help the child's teeth align properly.
   医生使用一种矫正设备帮助孩子的牙齿正确排列。
2. 2. The teacher provided a corrective feedback to help students improve their performance.
   老师提供了纠正反馈，帮助学生提高表现。
3. 3. The patient was given a corrective surgery to repair the damaged bone.
   病人接受了一次矫正手术来修复受损的骨骼。