郝大夫，您的任务是保持手术区的清洁。您还要帮助我抓住和结扎出血点。任先生，您要把持好牵引器和剪线。

• Dr. Hao, it is your duty to keep the surgical field clean. Also you should help me catch and tie the bleeders. Mr. Ren you should hold the retractors and cut the sutures.