antecolonic gastrojejunostomy

例句：

1. 1.The patient underwent antecolonic gastrojejunostomy to relieve his chronic constipation.
   患者接受了前结肠胃吻合术来缓解他的慢性便秘。
2. 2. The surgery was performed to correct the patient's anomaly and prevent future complications.
   手术是为了纠正患者的异常并预防未来的并发症。
3. 3. The procedure is a complex one requiring careful planning and execution.
   这是一种复杂的程序，需要仔细规划和执行。