morphinane alkaloid

例句：

1. 1. The patient was given an injection of morphine to relieve his pain.
   患者被注射了吗啡来缓解他的疼痛。
2. 2. Morphine is a powerful narcotic that can be used to treat severe pain.
   吗啡是一种强效的麻醉剂，可以用来治疗严重的疼痛。
3. 3. Morphine alkaloids are a class of compounds found in plants that have medicinal properties.
   吗啡烷类化合物是一类存在于植物中的具有药用性质的化合物。