melancholia

例句：

1. 1. She was diagnosed with melancholia after a year of unsuccessful treatment.
   她经过一年的治疗无效后被诊断出患有忧郁症。
2. 2.The patient's condition worsened during the night, and he was admitted to the hospital for melancholia treatment.
   患者的病情在夜间恶化，并被送往医院接受忧郁症治疗。
3. 3. He spent most of his time in bed, feeling depressed and hopeless, due to his melancholia.
   他大部分时间都躺在床上，感到沮丧和绝望，因为他患有忧郁症。