1. Costotomy is a surgical procedure used to deliver a baby by making an incision in the mother's abdomen.
剖宫术是一种通过在母亲的腹部切开来接生婴儿的外科手术。

2. The doctor performed a costotomy to safely deliver the baby when complications arose during labor.
在分娩过程中出现并发症时，医生进行了剖宫术以安全地接生婴儿。