Proctitis is common in patients undergoing pelvic radiation therapy.直肠炎常见于骨盆放射治疗的病人.This new plane is undergoing safety tests.这架新型飞机正在接受安全试验。New recruits have been undergoing training in recent weeks.最近几周，新兵正在接受训练。In 21 ...
New recruits have been undergoing training in recent weeks.最近几周，新兵正在接受训练。This powerful drug is used to tranquilize patients undergoing surgery.这种强效药剂被用来麻醉手术病人。The runway of this airport is undergoing expansion to accommo...