许多术后患者会在短期内使用阿片类药物来缓解疼痛。

Many post-surgery patients use ___opioids for short-term pain relief.

警方在突击行动中查获了大量非法opioids。

The police seized a large quantity of illegal ___opioids during the raid.

医生为他的慢性背痛开了阿片类止痛药。

The doctor prescribed ___opioids for his chronic back pain.