yī / shēng / gěi / tā / kāi / le / yì / zhǒng / zhèn / tòng / jì / bāng / zhù / huǎn / jiě / shǒu / shù / hòu / de / téng / tòng

医生给他开了一种镇痛剂，帮助缓解手术后的疼痛。

The doctor prescribed him a painkiller to relieve his postoperative pain.