“住院治疗”常见的英文表达是 “be hospitalized for treatment” 或 “receive inpatient treatment”。
be hospitalized for treatment：侧重于描述因某种疾病或状况而需要住院接受治疗这一行为状态。例如：He was hospitalized for treatment of pneumonia.（他因肺炎住院治疗。）
receive inpatient treatment：强调在医院接受住院形式的医疗护理这一过程。例如：Patients with severe injuries need to receive inpatient treatment.（伤势严重的患者需要住院治疗。 ）